Fits most cats and small and medium dogs.

Please check the breed/weight examples and measuring info here:  Size Guide

Weight varies: 

~4-20 lbs for thin builds

~6-35 lbs for muscular builds 

The Pandaloon Bumblebee features a special bee body design so the leg length is not needed: 

Size 1/2: Shoulder to shoulder width 4-6 inches. Max girth 21 inches. 

Size 3: Shoulder to shoulder width 6-8 inches. Max girth 27 inches.