| Size | Animal weight | Vest Length |
| Tiny | <7 lbs | 9.25 in |
| Toy | 7-15 lbs. | 12.25 in |
| Small | 15-30 lbs. | 13.5 in |
| Medium | 24-45 lbs. | 15.5 in |
| Large | 45-85 lbs. | 18.5 in |
| XLarge | 85-120 lbs. | 21 in |
| Giant | 120-160 lbs. | 24 in |
| XGiant | over 160 lbs. | 29.5 in |
| Maximum girth measurement is approximately double the vest length | ||
