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.
Note: If the dog has a stout build, select one size larger.
| Size | Length | Recommended sizing by breed |
| XX-Small | 8″ | Teacup and dogs under 5 lbs |
| X-Small | 10″ | Australian Terrier, Chihuahua, Pomeranian, Toy Poodle, Yorkshire Terrier |
| Small | 12″ | Boston Terrier, Jack Russell Terrier, Maltese, Pug, Silky Terrier |
| Small/Medium | 14″ | |
| Medium | 16″ | Bichon Frise, Beagle, Cocker Spaniel, Corgi, Scottish Terrier |
| Large | 20″ | Brittany Spaniel, Bulldog, Collie, Schnauzer, Springer Spaniel |
| X-Large | 24″ | Doberman Pinscher, German Shepherd, Golden Retriever, Labrador Retriever, Rottweiler |
