Extra Small: < 10 lbs (cats)

Small: 10 - 20 lbs (dachshund, chihuahua, or teacup breeds)

Medium: 20 - 45 lbs (emmetts, terriers, pocket pittys, pugs)

Large: 45 - 100 lbs (great pyrenees, husky, border collie)

Extra Large: > 100 lbs (by request only)

More Fluff = Bigger Size