Back: Measure length of pet’s back from the base of the neck to the base of the tail. See below for estimating by breed.
Neck: Measure the circumference of pet’s neck, snug but not tight. No need to add inches as you would with a collar.
Chest/Girth: Measure girth around the broadest part of the chest and add 2”.
Note: If the dog has a stout build, select one size larger.
Estimations by breed are for approximation only.
X-Small: Cat, Yorkshire Terrier, Chihuahua, Maltese, Italian Greyhound
Small: Beagle, Boston Terrier, Cocker Spaniel, Pug
Medium: Basset Hound, Bulldog, Keeshond, Norwegian Elkhound, Dalmatian
Medium-Large: Boxer, Standard Poodle, Golden Retriever, Labrador
Large: Afghan, Doberman, German Shepherd, Irish Setter, Rottweiler, Collie
X-Large: Great Dane, Great Pyrenees, Greyhound, Mastiff, Saint Bernard
| Size | Fits Length | Fits Necks | Fits Chests |
| X-Small | Up to 8" | 10" - 12" | 14" - 16" |
| Small | 8" - 12" | 12" - 14" | 16" - 18" |
| Medium | 12’ - 16" | 14" - 16" | 18" - 22" |
| Large | 16" - 20" | 16" - "18 | 22" - 26" |
| X-Large | 20" - 24" | 18" - 20" | 26" - 30" |