| Size | Back length | Chest girth | Neck girth | Typical weight |
|---|
| XS | 8 in | 13–15 in | 9–11 in | 4–8 lb |
| S | 10 in | 15–18 in | 11–13 in | 8–15 lb |
| M | 12 in | 18–22 in | 13–16 in | 15–30 lb |
| L | 14 in | 22–26 in | 16–19 in | 30–50 lb |
| XL | 16 in | 26–31 in | 19–22 in | 50–75 lb |
| XXL | 18 in | 31–36 in | 22–25 in | 75–100 lb |
How to measure: use a soft tape. Back = base of neck to base of tail · chest = widest point behind the front legs · neck = where the collar sits. Between sizes? Size up.
