XS FIT: 5-8lbs Yorkie, Maltese,Chihuahua, Small Jack Russels; S FIT: 9-12lbs Shih Tzu, Poodle Miniature, Teddy,Cockerpoos
M FIT: 13-20lbs Pug, Westie, Schnauzer poodle, Jack Russell; L FIT: 21-32lbs Beagle, Shiba Inu, Cocker Spaniel, etc.
We recommend that measure your dogs size before purchase