Size Length
(in inches)

Chest
(in inches)

Neck

(in inches)

Weight
Extra Small 17.5 12-14 9 4-6 lbs.
Small 20 14-17 11 6-8 lbs.
Medium 22.5 17-21 14 10-12 lbs.
Large 30 21-24 17.5 14-18 lbs.
Extra Large 32 24-27 21 20-25 lbs.