Matching Family Christmas themed Pajamas Pet Union Suit (Large) Santa Christmas Tree White, Size/chest size/weight XS-13-16"/up to 8lbs S - 16-20"/8-20lbs Med - 20-26"/20-40lbs Large - 26-32"/30-55lbs XL-32-36"/50-70lbs 2X - 36-40"/70-90lbs 3X - 40-44"/80-110lbs