Measure your dog's chest (widest part) and back (neck to base of tail). Between sizes? Size up.
| Size | Weight | Chest girth | Back length |
|---|---|---|---|
| XS | 3–6.5 lb | 13.0" | 8.7" |
| S | 6.5–11 lb | 15.7" | 10.6" |
| M | 11–17.5 lb | 18.5" | 12.6" |
| L | 17.5–26.5 lb | 21.3" | 14.6" |
| XL | 26.5–35 lb | 24.0" | 16.5" |
| XXL | 35–48.5 lb | 26.8" | 18.9" |
