Extra Extra Small
- Neck: 24-28cm
- Chest: 28-32cm
- Recommended Weight: 3-6 pounds
Extra Small
- Neck: 28-30cm
- Chest: 32-36cm
- Recommended Weight: 6-9 pounds
Small
- Neck: 30-32cm
- Chest: 36-44cm
- Recommended Weight: 9-13 pounds
Medium
- Neck: 32-34cm
- Chest: 44-48cm
- Recommended Weight: 13-17 pounds
Large
- Neck: 34-42cm
- Chest: 48-54cm
- Recommended Weight: 17-20 pounds