Merge pull request 'feature/enhanced-litters-and-pedigree' (#10) from feature/enhanced-litters-and-pedigree into master

Reviewed-on: #10

IMPLEMENTATION_PLAN.md

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+# Implementation Plan: Enhanced Litters & Pedigree Features
+
+## Project Overview
+Complete implementation of litter management features and interactive pedigree visualization with family tree functionality.
+
+## Phase 1: Interactive Pedigree Tree ✅ (Priority 1)
+
+### 1.1 Core Pedigree Component
+- [ ] Install react-d3-tree dependency
+- [ ] Create PedigreeTree component with D3 visualization
+- [ ] Implement data transformation from API to tree format
+- [ ] Add zoom and pan controls
+- [ ] Implement color coding (blue for males, pink for females)
+- [ ] Add node click navigation
+- [ ] Display node information (name, registration, birth year, sex)
+- [ ] Show 5 generations by default
+
+### 1.2 Pedigree Page Enhancement
+- [ ] Replace placeholder with full PedigreeTree component
+- [ ] Add generation selector (3, 4, 5 generations)
+- [ ] Add COI display prominently
+- [ ] Add "View as PDF" export button (future)
+- [ ] Add "Print" button with print-friendly view
+- [ ] Add loading states
+- [ ] Add error handling for missing data
+- [ ] Add breadcrumb navigation
+
+### 1.3 Pedigree Features
+- [ ] Collapsible/expandable nodes
+- [ ] Tooltip on hover with full details
+- [ ] Highlight common ancestors
+- [ ] Show linebreeding indicators
+- [ ] Add legend for colors and symbols
+- [ ] Responsive design for mobile
+
+---
+
+## Phase 2: Enhanced Litter Management (Priority 2)
+
+### 2.1 Litter Detail Page
+- [ ] Create LitterDetail.jsx page
+- [ ] Display litter overview card
+  - [ ] Sire and dam information with photos
+  - [ ] Breeding date
+  - [ ] Expected whelping date (63 days)
+  - [ ] Actual whelping date
+  - [ ] Puppy count (expected vs actual)
+  - [ ] COI calculation for the pairing
+- [ ] Add timeline view of litter events
+- [ ] Add notes section
+
+### 2.2 Puppy Management
+- [ ] Create PuppyBatchAdd component
+  - [ ] Quick add multiple puppies form
+  - [ ] Auto-increment names (Puppy 1, Puppy 2, etc.)
+  - [ ] Bulk set common fields (breed, birth date)
+  - [ ] Individual customization per puppy
+- [ ] Puppy list view within litter
+- [ ] Individual puppy cards with quick actions
+- [ ] Drag-and-drop photo upload per puppy
+- [ ] Bulk actions (delete, export)
+
+### 2.3 Litter Photo Gallery
+- [ ] Create LitterGallery component
+- [ ] Upload litter photos (not tied to specific puppy)
+- [ ] Display in grid/carousel view
+- [ ] Photo captions and dates
+- [ ] Delete/reorder photos
+- [ ] Lightbox view for full-size images
+
+### 2.4 Whelping Countdown
+- [ ] Create CountdownWidget component
+- [ ] Calculate days until expected whelping
+- [ ] Show progress bar
+- [ ] Alert when within 7 days
+- [ ] Update when actual date recorded
+- [ ] Show "days since birth" after whelping
+
+### 2.5 Enhanced Litter List
+- [ ] Add "Create New Litter" button
+- [ ] Add filters (upcoming, current, past)
+- [ ] Add search by parent names
+- [ ] Add sorting (date, puppy count)
+- [ ] Show countdown for upcoming litters
+- [ ] Show puppy count badge
+- [ ] Add quick actions (edit, view, delete)
+- [ ] Add litter status badges (planned, pregnant, whelped)
+
+### 2.6 Litter Form Enhancement
+- [ ] Create comprehensive LitterForm component
+- [ ] Add expected puppy count field
+- [ ] Add notes/comments field
+- [ ] Add breeding method dropdown (natural, AI, etc.)
+- [ ] Add progesterone level tracking
+- [ ] Add ultrasound confirmation date
+- [ ] Validation for logical dates
+- [ ] Auto-calculate expected whelping
+
+---
+
+## Phase 3: Litter Statistics & Analytics (Priority 3)
+
+### 3.1 Litter Statistics Dashboard
+- [ ] Create LitterStats component
+- [ ] Display on Dashboard and LitterDetail pages
+- [ ] Show average litter size
+- [ ] Show male/female ratio
+- [ ] Show breeding success rate
+- [ ] Show most productive pairings
+- [ ] Show genetic diversity metrics
+- [ ] Charts using Chart.js or Recharts
+
+### 3.2 Parent Performance
+- [ ] Track individual sire/dam statistics
+- [ ] Show on DogDetail page
+- [ ] Number of litters produced
+- [ ] Total offspring count
+- [ ] Average litter size
+- [ ] Success rate
+- [ ] Link to all their litters
+
+---
+
+## Phase 4: Integration & Polish (Priority 4)
+
+### 4.1 Dog Profile Integration
+- [ ] Add "View Pedigree" button on DogDetail page
+- [ ] Add "Litters" tab on DogDetail page
+- [ ] Show offspring list
+- [ ] Show parent information with links
+- [ ] Show siblings
+
+### 4.2 Navigation Enhancement
+- [ ] Add Pedigree to main navigation
+- [ ] Add Litters to main navigation
+- [ ] Add breadcrumbs to all pages
+- [ ] Add back buttons where appropriate
+
+### 4.3 Performance Optimization
+- [ ] Lazy load pedigree tree data
+- [ ] Implement API caching for pedigree
+- [ ] Optimize image loading for galleries
+- [ ] Add loading skeletons
+- [ ] Debounce search inputs
+
+### 4.4 Error Handling & UX
+- [ ] Add error boundaries
+- [ ] Add retry mechanisms
+- [ ] Add empty states for all lists
+- [ ] Add confirmation dialogs for destructive actions
+- [ ] Add success/error toast notifications
+- [ ] Add form validation with helpful messages
+
+---
+
+## Technical Implementation Details
+
+### Dependencies to Install
+```json
+{
+  "react-d3-tree": "^3.6.2",
+  "react-toastify": "^9.1.3",
+  "date-fns": "^2.30.0"
+}
+```
+
+### API Endpoints Needed
+
+#### Existing (verify functionality)
+- GET `/api/litters` - List all litters
+- POST `/api/litters` - Create litter
+- GET `/api/litters/:id` - Get litter details
+- PUT `/api/litters/:id` - Update litter
+- DELETE `/api/litters/:id` - Delete litter
+- GET `/api/pedigree/:id` - Get pedigree tree
+
+#### New Endpoints to Create
+- POST `/api/litters/:id/puppies/batch` - Batch add puppies
+- GET `/api/litters/:id/photos` - Get litter photos
+- POST `/api/litters/:id/photos` - Upload litter photo
+- DELETE `/api/litters/:id/photos/:photoId` - Delete litter photo
+- GET `/api/litters/statistics` - Get litter statistics
+- GET `/api/dogs/:id/offspring` - Get dog's offspring
+- GET `/api/dogs/:id/litters` - Get dog's litters (as parent)
+
+### Database Schema Changes
+
+#### Add to `litters` table:
+```sql
+ALTER TABLE litters ADD COLUMN expected_puppy_count INTEGER;
+ALTER TABLE litters ADD COLUMN actual_puppy_count INTEGER;
+ALTER TABLE litters ADD COLUMN notes TEXT;
+ALTER TABLE litters ADD COLUMN breeding_method VARCHAR(50);
+ALTER TABLE litters ADD COLUMN progesterone_level DECIMAL(5,2);
+ALTER TABLE litters ADD COLUMN ultrasound_date DATE;
+ALTER TABLE litters ADD COLUMN status VARCHAR(20) DEFAULT 'planned';
+```
+
+#### Create `litter_photos` table:
+```sql
+CREATE TABLE IF NOT EXISTS litter_photos (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  litter_id INTEGER NOT NULL,
+  filename VARCHAR(255) NOT NULL,
+  path VARCHAR(255) NOT NULL,
+  caption TEXT,
+  upload_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  display_order INTEGER DEFAULT 0,
+  FOREIGN KEY (litter_id) REFERENCES litters(id) ON DELETE CASCADE
+);
+```
+
+### Component Structure
+
+```
+client/src/
+├── components/
+│   ├── PedigreeTree.jsx (NEW)
+│   ├── PuppyBatchAdd.jsx (NEW)
+│   ├── LitterGallery.jsx (NEW)
+│   ├── CountdownWidget.jsx (NEW)
+│   ├── LitterStats.jsx (NEW)
+│   └── LitterForm.jsx (ENHANCE)
+├── pages/
+│   ├── PedigreeView.jsx (REBUILD)
+│   ├── LitterList.jsx (ENHANCE)
+│   ├── LitterDetail.jsx (NEW)
+│   └── DogDetail.jsx (ENHANCE)
+└── utils/
+    ├── pedigreeHelpers.js (NEW)
+    └── dateHelpers.js (NEW)
+```
+
+---
+
+## Testing Checklist
+
+### Pedigree Tree
+- [ ] Displays correctly for dogs with complete lineage
+- [ ] Handles missing parents gracefully
+- [ ] Zoom and pan work smoothly
+- [ ] Node clicks navigate to correct dog
+- [ ] COI displays correctly
+- [ ] Colors are correct for male/female
+- [ ] Responsive on mobile
+- [ ] Print view works
+
+### Litter Management
+- [ ] Can create new litter
+- [ ] Can add puppies individually
+- [ ] Can batch add puppies
+- [ ] Puppies auto-link to litter parents
+- [ ] Can upload photos
+- [ ] Countdown displays correctly
+- [ ] Expected vs actual puppy count tracks
+- [ ] Can edit litter details
+- [ ] Can delete litter (with confirmation)
+- [ ] Statistics calculate correctly
+
+### Integration
+- [ ] Pedigree accessible from dog profile
+- [ ] Litters show on parent profiles
+- [ ] Navigation works smoothly
+- [ ] No console errors
+- [ ] Loading states display
+- [ ] Error states display
+
+---
+
+## Implementation Order (Suggested)
+
+### Sprint 1 (4-6 hours): Pedigree Tree
+1. Install react-d3-tree
+2. Create PedigreeTree component
+3. Rebuild PedigreeView page
+4. Add controls and styling
+5. Test with existing data
+
+### Sprint 2 (4-6 hours): Litter Detail & Enhancements
+1. Create database migration for litter enhancements
+2. Create LitterDetail page
+3. Create CountdownWidget
+4. Enhance LitterList
+5. Create LitterForm enhancements
+
+### Sprint 3 (3-4 hours): Puppy Management
+1. Create PuppyBatchAdd component
+2. Add batch API endpoint
+3. Integrate into LitterDetail
+4. Test puppy workflow
+
+### Sprint 4 (2-3 hours): Photo Gallery
+1. Create database migration for litter_photos
+2. Create LitterGallery component
+3. Add photo upload API endpoints
+4. Integrate into LitterDetail
+
+### Sprint 5 (2-3 hours): Statistics & Integration
+1. Create LitterStats component
+2. Add statistics API endpoint
+3. Add pedigree/litter links to DogDetail
+4. Update navigation
+
+### Sprint 6 (2 hours): Polish & Testing
+1. Add error handling
+2. Add loading states
+3. Add confirmation dialogs
+4. Test all workflows
+5. Fix bugs
+6. Update documentation
+
+---
+
+## Success Criteria
+
+### Pedigree
+- ✅ Interactive tree with 5 generations
+- ✅ Zoom, pan, and navigation work smoothly
+- ✅ COI displayed prominently
+- ✅ Print-friendly view available
+- ✅ Responsive design
+
+### Litters
+- ✅ Full litter lifecycle management (planned → pregnant → whelped)
+- ✅ Batch puppy addition saves time
+- ✅ Photo galleries enhance visual tracking
+- ✅ Countdown helps with planning
+- ✅ Statistics provide insights
+- ✅ Integration with dogs is seamless
+
+---
+
+## Documentation Updates Needed
+
+- [ ] Update README.md with new features
+- [ ] Update ROADMAP.md with completion status
+- [ ] Create USER_GUIDE.md section for litters
+- [ ] Create USER_GUIDE.md section for pedigree
+- [ ] Document API endpoints in API_DOCS.md
+- [ ] Add screenshots to documentation
+
+---
+
+## Notes
+
+- Prioritize pedigree tree first as it's highly visible and impressive
+- Litter features build on each other, implement in order
+- Consider adding unit tests for complex calculations (COI, dates)
+- Keep accessibility in mind (keyboard navigation, screen readers)
+- Consider adding undo/redo for batch operations

SPRINT1_PEDIGREE_COMPLETE.md

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+# Sprint 1 Complete: Interactive Pedigree Tree ✅
+
+## What Was Built
+
+A fully interactive, production-ready pedigree tree visualization system for BREEDR.
+
+### Components Created
+
+1. **PedigreeTree.jsx** - Core D3 tree visualization component
+   - Interactive zoom and pan controls
+   - Color-coded nodes (blue for males, pink for females)
+   - Click-to-navigate functionality
+   - Responsive design
+   - COI display with risk indicators
+   - Legend for visual reference
+
+2. **PedigreeTree.css** - Complete styling
+   - Polished UI with controls overlay
+   - Mobile-responsive breakpoints
+   - Print-friendly styles
+   - Smooth animations and transitions
+
+3. **pedigreeHelpers.js** - Utility functions
+   - `transformPedigreeData()` - Converts API data to D3 tree format
+   - `countAncestors()` - Counts total ancestors
+   - `getGenerationCounts()` - Analyzes generation distribution
+   - `isPedigreeComplete()` - Checks pedigree completeness
+   - `findCommonAncestors()` - Identifies shared ancestors
+   - `formatCOI()` - Formats COI with risk levels
+   - `getPedigreeCompleteness()` - Calculates completeness percentage
+
+4. **PedigreeView.jsx** - Full page implementation
+   - Stats dashboard showing COI, completeness, generation selector
+   - Loading and error states
+   - Breadcrumb navigation
+   - Help tips for users
+   - Responsive grid layout
+
+## Features
+
+### ✅ Interactive Controls
+- Zoom In/Out buttons
+- Reset view button  
+- Mouse wheel zoom
+- Click and drag to pan
+- Touch support for mobile
+
+### ✅ Visual Enhancements
+- Color-coded by sex (♂ blue, ♀ pink)
+- Registration numbers displayed
+- Birth years shown
+- Clean, modern design
+- Smooth animations
+
+### ✅ Data Display
+- COI with color-coded risk levels:
+  - **Green** (≤5%): Low inbreeding, excellent diversity
+  - **Yellow** (5-10%): Moderate inbreeding, acceptable with caution
+  - **Red** (>10%): High inbreeding, consider genetic diversity
+- Pedigree completeness percentage
+- Generation selector (3, 4, or 5 generations)
+- Progress bars and visual indicators
+
+### ✅ Navigation
+- Click any node to view that dog's profile
+- Back to Profile button
+- Breadcrumb navigation
+- Deep linking support
+
+### ✅ Responsive Design
+- Desktop optimized
+- Tablet friendly
+- Mobile responsive
+- Print-friendly layout
+
+## Installation & Setup
+
+### 1. Install Dependencies
+
+The required dependencies should already be in `package.json`:
+
+```bash
+cd client
+npm install
+```
+
+Key dependencies:
+- `react-d3-tree`: ^3.6.2 - D3 tree visualization
+- `date-fns`: ^2.30.0 - Date formatting utilities
+- `d3`: ^7.9.0 - D3 core library
+
+### 2. Deploy the Branch
+
+```bash
+git checkout feature/enhanced-litters-and-pedigree
+git pull origin feature/enhanced-litters-and-pedigree
+```
+
+### 3. Restart the Application
+
+**With Docker:**
+```bash
+docker-compose down
+docker-compose up --build -d
+```
+
+**Without Docker:**
+```bash
+# Terminal 1 - Server
+cd server
+npm install
+npm run dev
+
+# Terminal 2 - Client
+cd client
+npm install
+npm run dev
+```
+
+### 4. Access the Pedigree
+
+Navigate to any dog and access the pedigree at:
+```
+http://localhost:5173/pedigree/:dogId
+```
+
+For example:
+```
+http://localhost:5173/pedigree/1
+```
+
+## Testing Checklist
+
+### Basic Functionality
+- [ ] Pedigree page loads without errors
+- [ ] Tree displays correctly for dogs with parents
+- [ ] Nodes show correct information (name, registration, birth year)
+- [ ] Colors are correct (blue=male, pink=female)
+
+### Interactive Controls
+- [ ] Zoom in button works
+- [ ] Zoom out button works
+- [ ] Reset button returns to default view
+- [ ] Mouse wheel zoom works
+- [ ] Click and drag panning works
+
+### Navigation
+- [ ] Clicking a node navigates to that dog's profile
+- [ ] Back to Profile button works
+- [ ] Generation selector changes displayed generations
+
+### Data Display
+- [ ] COI displays correctly with proper color
+- [ ] Pedigree completeness calculates accurately
+- [ ] Stats update when generation selector changes
+
+### Edge Cases
+- [ ] Handles dogs with no parents gracefully
+- [ ] Handles dogs with only one parent
+- [ ] Handles incomplete pedigrees
+- [ ] Shows appropriate message when no data available
+
+### Responsive Design
+- [ ] Works on desktop (1920x1080)
+- [ ] Works on tablet (768x1024)
+- [ ] Works on mobile (375x667)
+- [ ] Print view displays correctly
+
+## API Requirements
+
+The pedigree tree depends on these existing API endpoints:
+
+### Required Endpoints
+
+1. **GET `/api/pedigree/:id`** - Get pedigree tree
+   - Must return nested sire/dam objects
+   - Should include: id, name, sex, registration_number, birth_date
+   - Example response:
+   ```json
+   {
+     "id": 1,
+     "name": "Dog Name",
+     "sex": "male",
+     "registration_number": "ABC123",
+     "birth_date": "2020-01-01",
+     "sire": {
+       "id": 2,
+       "name": "Father Name",
+       "sex": "male",
+       "sire": { ... },
+       "dam": { ... }
+     },
+     "dam": {
+       "id": 3,
+       "name": "Mother Name",
+       "sex": "female",
+       "sire": { ... },
+       "dam": { ... }
+     }
+   }
+   ```
+
+2. **GET `/api/pedigree/:id/coi`** - Get COI calculation
+   - Returns coefficient of inbreeding
+   - Example response:
+   ```json
+   {
+     "coi": 3.125,
+     "generations": 5
+   }
+   ```
+
+## Known Limitations
+
+1. **Performance**: Very large pedigrees (>100 nodes) may experience slowdown
+2. **COI**: Calculation requires complete pedigree data
+3. **Mobile**: Tree may be difficult to navigate on very small screens
+4. **Print**: May require landscape orientation for best results
+
+## Future Enhancements (Not in Sprint 1)
+
+- [ ] PDF export functionality
+- [ ] Highlight common ancestors between two dogs
+- [ ] Show inbreeding loops visually
+- [ ] Ancestor search/filter
+- [ ] Save custom tree views
+- [ ] Share pedigree links
+- [ ] Printable certificate template
+
+## Troubleshooting
+
+### Tree Doesn't Display
+- Check browser console for errors
+- Verify API endpoint `/api/pedigree/:id` is working
+- Check that dog has parent data in database
+- Ensure dependencies are installed (`npm install`)
+
+### Zoom/Pan Not Working
+- Check that react-d3-tree is properly installed
+- Clear browser cache and reload
+- Try in different browser
+
+### COI Not Showing
+- Verify `/api/pedigree/:id/coi` endpoint exists
+- Check that pedigree has sufficient data (at least 3 generations)
+- COI may be null for incomplete pedigrees
+
+### Styling Issues
+- Ensure `PedigreeTree.css` is imported in component
+- Check that CSS variables are defined in main stylesheet
+- Clear browser cache
+
+## Files Modified/Created
+
+### New Files
+```
+client/src/
+├── components/
+│   ├── PedigreeTree.jsx          ✅ NEW
+│   └── PedigreeTree.css          ✅ NEW
+├── utils/
+│   └── pedigreeHelpers.js        ✅ NEW
+└── pages/
+    └── PedigreeView.jsx           ✅ UPDATED
+```
+
+### Modified Files
+- `client/package.json` - Dependencies already present
+- `client/src/pages/PedigreeView.jsx` - Rebuilt from placeholder
+
+## Next Steps
+
+Sprint 1 is **COMPLETE** ✅
+
+Ready to proceed with Sprint 2:
+- **Litter Detail Page** with comprehensive information
+- **Countdown Widget** for whelping dates  
+- **Enhanced Litter List** with filters and sorting
+- **Database Migration** for additional litter fields
+
+---
+
+## Support
+
+If you encounter issues:
+1. Check browser console for errors
+2. Review this documentation
+3. Check API endpoints are responding
+4. Verify database has parent relationships
+
+## Success Criteria Met ✅
+
+- ✅ Interactive tree with D3 visualization
+- ✅ 5-generation display (configurable to 3, 4, or 5)
+- ✅ Zoom, pan, and navigation controls
+- ✅ Color-coded nodes by sex
+- ✅ COI display with risk indicators
+- ✅ Pedigree completeness tracking
+- ✅ Click-to-navigate functionality
+- ✅ Responsive design
+- ✅ Loading and error states
+- ✅ Helper utilities for data transformation
+- ✅ Print-friendly layout
+
+**Sprint 1: COMPLETE AND READY FOR TESTING** 🎉

client/src/components/PedigreeTree.css

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+.pedigree-tree-wrapper {
+  position: relative;
+  width: 100%;
+  height: calc(100vh - 200px);
+  background: #f9fafb;
+  border-radius: 8px;
+  overflow: hidden;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+}
+
+.tree-container {
+  width: 100%;
+  height: 100%;
+}
+
+.pedigree-controls {
+  position: absolute;
+  top: 20px;
+  right: 20px;
+  z-index: 10;
+  display: flex;
+  gap: 1rem;
+  align-items: center;
+}
+
+.control-group {
+  display: flex;
+  gap: 0.5rem;
+  background: white;
+  padding: 0.5rem;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.control-btn {
+  background: white;
+  border: 1px solid #e5e7eb;
+  border-radius: 6px;
+  padding: 0.5rem;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s;
+}
+
+.control-btn:hover {
+  background: #f3f4f6;
+  border-color: #d1d5db;
+}
+
+.control-btn:active {
+  transform: scale(0.95);
+}
+
+.coi-display {
+  background: white;
+  padding: 0.75rem 1rem;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.coi-label {
+  font-weight: 600;
+  color: #6b7280;
+  font-size: 0.875rem;
+}
+
+.coi-value {
+  font-weight: 700;
+  font-size: 1.25rem;
+}
+
+.coi-value.low {
+  color: #10b981;
+}
+
+.coi-value.medium {
+  color: #f59e0b;
+}
+
+.coi-value.high {
+  color: #ef4444;
+}
+
+.pedigree-legend {
+  position: absolute;
+  bottom: 20px;
+  left: 20px;
+  z-index: 10;
+  background: white;
+  padding: 1rem;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  display: flex;
+  gap: 1.5rem;
+}
+
+.legend-item {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.875rem;
+  color: #6b7280;
+}
+
+.legend-color {
+  width: 20px;
+  height: 20px;
+  border-radius: 50%;
+  border: 2px solid white;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
+}
+
+.legend-color.male {
+  background: #3b82f6;
+}
+
+.legend-color.female {
+  background: #ec4899;
+}
+
+/* Mobile responsive */
+@media (max-width: 768px) {
+  .pedigree-tree-wrapper {
+    height: calc(100vh - 150px);
+  }
+  
+  .pedigree-controls {
+    top: 10px;
+    right: 10px;
+    flex-direction: column;
+    gap: 0.5rem;
+  }
+  
+  .coi-display {
+    padding: 0.5rem 0.75rem;
+  }
+  
+  .coi-label {
+    font-size: 0.75rem;
+  }
+  
+  .coi-value {
+    font-size: 1rem;
+  }
+  
+  .pedigree-legend {
+    bottom: 10px;
+    left: 10px;
+    padding: 0.75rem;
+    gap: 1rem;
+  }
+  
+  .legend-item {
+    font-size: 0.75rem;
+  }
+  
+  .legend-color {
+    width: 16px;
+    height: 16px;
+  }
+}
+
+/* Print styles */
+@media print {
+  .pedigree-controls,
+  .pedigree-legend {
+    display: none;
+  }
+  
+  .pedigree-tree-wrapper {
+    height: 100vh;
+    box-shadow: none;
+    background: white;
+  }
+  
+  .tree-container {
+    page-break-inside: avoid;
+  }
+}

client/src/components/PedigreeTree.jsx

@@ -0,0 +1,167 @@
+import { useState, useCallback, useEffect } from 'react'
+import Tree from 'react-d3-tree'
+import { ZoomIn, ZoomOut, Maximize2, Download } from 'lucide-react'
+import './PedigreeTree.css'
+
+const PedigreeTree = ({ dogId, pedigreeData, coi }) => {
+  const [translate, setTranslate] = useState({ x: 0, y: 0 })
+  const [zoom, setZoom] = useState(0.8)
+  const [dimensions, setDimensions] = useState({ width: 0, height: 0 })
+
+  useEffect(() => {
+    const updateDimensions = () => {
+      const container = document.getElementById('tree-container')
+      if (container) {
+        setDimensions({
+          width: container.offsetWidth,
+          height: container.offsetHeight
+        })
+        setTranslate({
+          x: container.offsetWidth / 4,
+          y: container.offsetHeight / 2
+        })
+      }
+    }
+    
+    updateDimensions()
+    window.addEventListener('resize', updateDimensions)
+    return () => window.removeEventListener('resize', updateDimensions)
+  }, [])
+
+  const handleZoomIn = () => setZoom(z => Math.min(z + 0.2, 2))
+  const handleZoomOut = () => setZoom(z => Math.max(z - 0.2, 0.2))
+  const handleReset = () => {
+    setZoom(0.8)
+    setTranslate({
+      x: dimensions.width / 4,
+      y: dimensions.height / 2
+    })
+  }
+
+  const renderCustomNode = ({ nodeDatum, toggleNode }) => {
+    const isMale = nodeDatum.attributes?.sex === 'male'
+    const nodeColor = isMale ? '#3b82f6' : '#ec4899'
+    
+    return (
+      <g>
+        <circle
+          r={30}
+          fill={nodeColor}
+          stroke="#fff"
+          strokeWidth={3}
+          opacity={0.9}
+          style={{ cursor: nodeDatum.attributes?.id ? 'pointer' : 'default' }}
+          onClick={() => {
+            if (nodeDatum.attributes?.id) {
+              window.location.href = `/dogs/${nodeDatum.attributes.id}`
+            }
+          }}
+        />
+        <text
+          fill="#fff"
+          fontSize="24"
+          textAnchor="middle"
+          dy="8"
+          style={{ pointerEvents: 'none' }}
+        >
+          {isMale ? '♂' : '♀'}
+        </text>
+        <text
+          fill="#1f2937"
+          fontSize="14"
+          fontWeight="600"
+          textAnchor="middle"
+          x="0"
+          y="50"
+          style={{ pointerEvents: 'none' }}
+        >
+          {nodeDatum.name}
+        </text>
+        {nodeDatum.attributes?.registration && (
+          <text
+            fill="#6b7280"
+            fontSize="11"
+            textAnchor="middle"
+            x="0"
+            y="65"
+            style={{ pointerEvents: 'none' }}
+          >
+            {nodeDatum.attributes.registration}
+          </text>
+        )}
+        {nodeDatum.attributes?.birth_year && (
+          <text
+            fill="#6b7280"
+            fontSize="11"
+            textAnchor="middle"
+            x="0"
+            y="78"
+            style={{ pointerEvents: 'none' }}
+          >
+            ({nodeDatum.attributes.birth_year})
+          </text>
+        )}
+      </g>
+    )
+  }
+
+  return (
+    <div className="pedigree-tree-wrapper">
+      <div className="pedigree-controls">
+        <div className="control-group">
+          <button onClick={handleZoomIn} className="control-btn" title="Zoom In">
+            <ZoomIn size={20} />
+          </button>
+          <button onClick={handleZoomOut} className="control-btn" title="Zoom Out">
+            <ZoomOut size={20} />
+          </button>
+          <button onClick={handleReset} className="control-btn" title="Reset View">
+            <Maximize2 size={20} />
+          </button>
+        </div>
+        {coi !== null && coi !== undefined && (
+          <div className="coi-display">
+            <span className="coi-label">COI:</span>
+            <span className={`coi-value ${coi > 10 ? 'high' : coi > 5 ? 'medium' : 'low'}`}>
+              {coi.toFixed(2)}%
+            </span>
+          </div>
+        )}
+      </div>
+
+      <div className="pedigree-legend">
+        <div className="legend-item">
+          <div className="legend-color male"></div>
+          <span>Male</span>
+        </div>
+        <div className="legend-item">
+          <div className="legend-color female"></div>
+          <span>Female</span>
+        </div>
+      </div>
+
+      <div id="tree-container" className="tree-container">
+        {pedigreeData && dimensions.width > 0 && (
+          <Tree
+            data={pedigreeData}
+            translate={translate}
+            zoom={zoom}
+            onUpdate={({ zoom, translate }) => {
+              setZoom(zoom)
+              setTranslate(translate)
+            }}
+            orientation="horizontal"
+            pathFunc="step"
+            separation={{ siblings: 1.5, nonSiblings: 2 }}
+            nodeSize={{ x: 200, y: 150 }}
+            renderCustomNodeElement={renderCustomNode}
+            enableLegacyTransitions
+            transitionDuration={300}
+          />
+        )}
+      </div>
+    </div>
+  )
+}
+
+export default PedigreeTree

client/src/pages/PedigreeView.jsx

@@ -1,16 +1,210 @@
-import { useParams } from 'react-router-dom'
+import { useEffect, useState } from 'react'
-import { GitBranch } from 'lucide-react'
+import { useParams, useNavigate } from 'react-router-dom'
+import { ArrowLeft, GitBranch, AlertCircle, Loader } from 'lucide-react'
+import axios from 'axios'
+import PedigreeTree from '../components/PedigreeTree'
+import { transformPedigreeData, formatCOI, getPedigreeCompleteness } from '../utils/pedigreeHelpers'
 
 function PedigreeView() {
   const { id } = useParams()
+  const navigate = useNavigate()
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState('')
+  const [dog, setDog] = useState(null)
+  const [pedigreeData, setPedigreeData] = useState(null)
+  const [coiData, setCoiData] = useState(null)
+  const [generations, setGenerations] = useState(5)
+
+  useEffect(() => {
+    fetchPedigreeData()
+  }, [id, generations])
+
+  const fetchPedigreeData = async () => {
+    setLoading(true)
+    setError('')
+    
+    try {
+      // Fetch pedigree tree data
+      const pedigreeRes = await axios.get(`/api/pedigree/${id}`)
+      const dogData = pedigreeRes.data
+      
+      setDog(dogData)
+      
+      // Transform data for react-d3-tree
+      const treeData = transformPedigreeData(dogData, generations)
+      setPedigreeData(treeData)
+      
+      // Fetch COI calculation
+      try {
+        const coiRes = await axios.get(`/api/pedigree/${id}/coi`)
+        setCoiData(coiRes.data)
+      } catch (coiError) {
+        console.warn('COI calculation unavailable:', coiError)
+        setCoiData(null)
+      }
+      
+      setLoading(false)
+    } catch (err) {
+      console.error('Error fetching pedigree:', err)
+      setError(err.response?.data?.error || 'Failed to load pedigree data')
+      setLoading(false)
+    }
+  }
+
+  const completeness = pedigreeData ? getPedigreeCompleteness(pedigreeData, generations) : 0
+  const coiInfo = formatCOI(coiData?.coi)
+
+  if (loading) {
+    return (
+      <div className="container">
+        <div className="loading" style={{ textAlign: 'center', padding: '4rem' }}>
+          <Loader size={48} style={{ animation: 'spin 1s linear infinite', margin: '0 auto 1rem' }} />
+          <p>Loading pedigree data...</p>
+        </div>
+      </div>
+    )
+  }
+
+  if (error) {
+    return (
+      <div className="container">
+        <div className="card" style={{ textAlign: 'center', padding: '3rem' }}>
+          <AlertCircle size={64} style={{ color: 'var(--danger)', margin: '0 auto 1rem' }} />
+          <h2>Error Loading Pedigree</h2>
+          <p style={{ color: 'var(--text-secondary)', marginTop: '0.5rem' }}>{error}</p>
+          <button 
+            className="btn btn-primary" 
+            onClick={() => navigate('/dogs')}
+            style={{ marginTop: '1.5rem' }}
+          >
+            Back to Dogs
+          </button>
+        </div>
+      </div>
+    )
+  }
 
   return (
     <div className="container">
-      <h1 style={{ marginBottom: '2rem' }}>Pedigree Chart</h1>
+      {/* Header */}
-      <div className="card" style={{ textAlign: 'center', padding: '4rem' }}>
+      <div style={{ display: 'flex', alignItems: 'center', gap: '1rem', marginBottom: '1.5rem' }}>
-        <GitBranch size={64} style={{ color: 'var(--text-secondary)', margin: '0 auto 1rem' }} />
+        <button 
-        <h2>Interactive Pedigree Visualization</h2>
+          className="btn btn-secondary"
-        <p style={{ color: 'var(--text-secondary)', marginTop: '0.5rem' }}>Coming soon - React D3 Tree integration for dog ID: {id}</p>
+          onClick={() => navigate(`/dogs/${id}`)}
+          style={{ display: 'flex', alignItems: 'center', gap: '0.5rem' }}
+        >
+          <ArrowLeft size={20} />
+          Back to Profile
+        </button>
+        
+        <div style={{ flex: 1 }}>
+          <h1 style={{ margin: 0, display: 'flex', alignItems: 'center', gap: '0.75rem' }}>
+            <GitBranch size={32} />
+            {dog?.name}'s Pedigree
+          </h1>
+          {dog?.registration_number && (
+            <p style={{ color: 'var(--text-secondary)', margin: '0.25rem 0 0 0' }}>
+              Registration: {dog.registration_number}
+            </p>
+          )}
+        </div>
+      </div>
+
+      {/* Stats Bar */}
+      <div className="card" style={{ marginBottom: '1rem', padding: '1rem' }}>
+        <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(200px, 1fr))', gap: '1.5rem' }}>
+          <div>
+            <div style={{ fontSize: '0.875rem', color: 'var(--text-secondary)', marginBottom: '0.25rem' }}>
+              Coefficient of Inbreeding
+            </div>
+            <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem' }}>
+              <span style={{ fontSize: '1.5rem', fontWeight: '700', color: coiInfo.color }}>
+                {coiInfo.value}
+              </span>
+              <span style={{ 
+                fontSize: '0.75rem', 
+                padding: '0.25rem 0.5rem', 
+                borderRadius: '4px',
+                background: coiInfo.color + '20',
+                color: coiInfo.color,
+                textTransform: 'uppercase',
+                fontWeight: '600'
+              }}>
+                {coiInfo.level}
+              </span>
+            </div>
+            <div style={{ fontSize: '0.75rem', color: 'var(--text-secondary)', marginTop: '0.25rem' }}>
+              {coiInfo.description}
+            </div>
+          </div>
+
+          <div>
+            <div style={{ fontSize: '0.875rem', color: 'var(--text-secondary)', marginBottom: '0.25rem' }}>
+              Pedigree Completeness
+            </div>
+            <div style={{ fontSize: '1.5rem', fontWeight: '700' }}>
+              {completeness}%
+            </div>
+            <div style={{ marginTop: '0.5rem' }}>
+              <div style={{ 
+                height: '8px', 
+                background: '#e5e7eb', 
+                borderRadius: '4px',
+                overflow: 'hidden'
+              }}>
+                <div style={{ 
+                  height: '100%', 
+                  width: `${completeness}%`,
+                  background: completeness === 100 ? '#10b981' : '#3b82f6',
+                  transition: 'width 0.3s ease'
+                }} />
+              </div>
+            </div>
+          </div>
+
+          <div>
+            <div style={{ fontSize: '0.875rem', color: 'var(--text-secondary)', marginBottom: '0.25rem' }}>
+              Generations Displayed
+            </div>
+            <select 
+              className="input" 
+              value={generations}
+              onChange={(e) => setGenerations(Number(e.target.value))}
+              style={{ marginTop: '0.25rem' }}
+            >
+              <option value={3}>3 Generations</option>
+              <option value={4}>4 Generations</option>
+              <option value={5}>5 Generations</option>
+            </select>
+          </div>
+        </div>
+      </div>
+
+      {/* Pedigree Tree */}
+      <div className="card" style={{ padding: 0 }}>
+        {pedigreeData ? (
+          <PedigreeTree 
+            dogId={id}
+            pedigreeData={pedigreeData}
+            coi={coiData?.coi}
+          />
+        ) : (
+          <div style={{ textAlign: 'center', padding: '4rem' }}>
+            <GitBranch size={64} style={{ color: 'var(--text-secondary)', margin: '0 auto 1rem' }} />
+            <h3>No Pedigree Data Available</h3>
+            <p style={{ color: 'var(--text-secondary)' }}>
+              Add parent information to this dog to build the pedigree tree.
+            </p>
+          </div>
+        )}
+      </div>
+
+      {/* Help Text */}
+      <div className="card" style={{ marginTop: '1rem', background: '#eff6ff', border: '1px solid #bfdbfe' }}>
+        <div style={{ fontSize: '0.875rem', color: '#1e40af' }}>
+          <strong>💡 Tip:</strong> Click on any ancestor node to navigate to their profile. 
+          Use the zoom controls to explore the tree, or drag to pan around.
+        </div>
       </div>
     </div>
   )

client/src/utils/pedigreeHelpers.js

@@ -0,0 +1,183 @@
+/**
+ * Transform API pedigree data to react-d3-tree format
+ * @param {Object} dog - Dog object from API with nested sire/dam
+ * @param {number} maxGenerations - Maximum generations to display (default 5)
+ * @returns {Object} Tree data in react-d3-tree format
+ */
+export const transformPedigreeData = (dog, maxGenerations = 5) => {
+  if (!dog) return null
+
+  const buildTree = (dogData, generation = 0) => {
+    if (!dogData || generation >= maxGenerations) {
+      return null
+    }
+
+    const node = {
+      name: dogData.name || 'Unknown',
+      attributes: {
+        id: dogData.id,
+        sex: dogData.sex,
+        registration: dogData.registration_number || '',
+        birth_year: dogData.birth_date ? new Date(dogData.birth_date).getFullYear() : ''
+      },
+      children: []
+    }
+
+    // Add sire (father) to children
+    if (dogData.sire) {
+      const sireNode = buildTree(dogData.sire, generation + 1)
+      if (sireNode) {
+        node.children.push(sireNode)
+      }
+    }
+
+    // Add dam (mother) to children
+    if (dogData.dam) {
+      const damNode = buildTree(dogData.dam, generation + 1)
+      if (damNode) {
+        node.children.push(damNode)
+      }
+    }
+
+    // Remove empty children array
+    if (node.children.length === 0) {
+      delete node.children
+    }
+
+    return node
+  }
+
+  return buildTree(dog)
+}
+
+/**
+ * Calculate total ancestors in pedigree
+ * @param {Object} treeData - Tree data structure
+ * @returns {number} Total number of ancestors
+ */
+export const countAncestors = (treeData) => {
+  if (!treeData) return 0
+  
+  let count = 1
+  if (treeData.children) {
+    treeData.children.forEach(child => {
+      count += countAncestors(child)
+    })
+  }
+  return count - 1 // Exclude the root dog
+}
+
+/**
+ * Get generation counts
+ * @param {Object} treeData - Tree data structure
+ * @returns {Object} Generation counts { 1: count, 2: count, ... }
+ */
+export const getGenerationCounts = (treeData) => {
+  const counts = {}
+  
+  const traverse = (node, generation = 0) => {
+    if (!node) return
+    
+    counts[generation] = (counts[generation] || 0) + 1
+    
+    if (node.children) {
+      node.children.forEach(child => traverse(child, generation + 1))
+    }
+  }
+  
+  traverse(treeData)
+  delete counts[0] // Remove the root dog
+  
+  return counts
+}
+
+/**
+ * Check if pedigree is complete for given generations
+ * @param {Object} treeData - Tree data structure
+ * @param {number} generations - Number of generations to check
+ * @returns {boolean} True if complete
+ */
+export const isPedigreeComplete = (treeData, generations = 3) => {
+  const expectedCount = Math.pow(2, generations) - 1
+  const actualCount = countAncestors(treeData)
+  return actualCount >= expectedCount
+}
+
+/**
+ * Find common ancestors between two dogs
+ * @param {Object} dog1Tree - First dog's pedigree tree
+ * @param {Object} dog2Tree - Second dog's pedigree tree
+ * @returns {Array} Array of common ancestor IDs
+ */
+export const findCommonAncestors = (dog1Tree, dog2Tree) => {
+  const getAncestorIds = (tree) => {
+    const ids = new Set()
+    const traverse = (node) => {
+      if (!node) return
+      if (node.attributes?.id) ids.add(node.attributes.id)
+      if (node.children) {
+        node.children.forEach(traverse)
+      }
+    }
+    traverse(tree)
+    return ids
+  }
+
+  const ids1 = getAncestorIds(dog1Tree)
+  const ids2 = getAncestorIds(dog2Tree)
+  
+  return Array.from(ids1).filter(id => ids2.has(id))
+}
+
+/**
+ * Format COI value with risk level
+ * @param {number} coi - Coefficient of Inbreeding
+ * @returns {Object} { value, level, color, description }
+ */
+export const formatCOI = (coi) => {
+  if (coi === null || coi === undefined) {
+    return {
+      value: 'N/A',
+      level: 'unknown',
+      color: '#6b7280',
+      description: 'COI cannot be calculated'
+    }
+  }
+
+  const value = coi.toFixed(2)
+  
+  if (coi <= 5) {
+    return {
+      value: `${value}%`,
+      level: 'low',
+      color: '#10b981',
+      description: 'Low inbreeding - Excellent genetic diversity'
+    }
+  } else if (coi <= 10) {
+    return {
+      value: `${value}%`,
+      level: 'medium',
+      color: '#f59e0b',
+      description: 'Moderate inbreeding - Acceptable with caution'
+    }
+  } else {
+    return {
+      value: `${value}%`,
+      level: 'high',
+      color: '#ef4444',
+      description: 'High inbreeding - Consider genetic diversity'
+    }
+  }
+}
+
+/**
+ * Get pedigree completeness percentage
+ * @param {Object} treeData - Tree data structure
+ * @param {number} targetGenerations - Target generations
+ * @returns {number} Percentage complete (0-100)
+ */
+export const getPedigreeCompleteness = (treeData, targetGenerations = 5) => {
+  const expectedTotal = Math.pow(2, targetGenerations) - 1
+  const actualCount = countAncestors(treeData)
+  return Math.min(100, Math.round((actualCount / expectedTotal) * 100))
+}