The following measurements are the dimensions of the actual product, not of the pet they fit. After measuring your pet, make sure all measurements fit within the following dimensions (with a little room to spare in the chest and neck).
| Back Length | Approx. Weight |
| XX-Small | 6" | 3 - 5 lbs. |
| X-Small | 8" | 6 - 10 lbs. |
| Small | 10" | 11 - 15 lbs |
Medium
| 12" | 16 - 25 lbs. |
Large
| 14" | 25 - 40 lbs. |
| X-Large | 18" | 40 - 50 lbs. |
| XX-Large | 22" | 50 - 60 lbs. |
| XXX-Large | 24" | 60 - 80 lbs. |
