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).
| Chest (Most Important) | Neck | Length |
| XX-Small | 10" | 7" | 6" |
| X-Small | 12" | 8" | 8" |
| Small | 14" | 11" | 10" |
Medium
| 17" | 12" | 12" |
| Large | 22" | 15" | 14" |
| X-Large | 24" | 18" | 18" |
| XX-Large | 32" | 20" | 22" |
| XXX-Large | 40" | 24" | 24" |
