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 |
| X-SMALL | 14" | 11.5" | 9.5" |
| SMALL | 17" | 13" | 11" |
| MEDIUM | 18" | 14.5" | 12.5" |
| LARGE | 20" | 16.5" | 15" |
| X-LARGE | 24.5" | 18.5" | 18.5" |
