DDXS01 Size: Extra Small (3.5" H x 8" W x 4" L) Features: -Diaper.-Extra Small fits dogs 4 - 8 lbs.-Small fits dogs 8 - 15 lbs.-Medium fits dogs 15 - 35 lbs.-Large fits dogs 35 - 55 lbs.-Extra Large fits dogs 55 - 90 lbs.-Extra Small: 3.5" H x 8" W x 4" D, 0.5 lb.-Small: 4" H x 8.5" W x 4" D, 1 lb.-Medium: 5" H x 9" W x 5" D, 1.25 lbs.-Large: 4" H x 10" W x 6" D, 1.75 lbs.-Extra Large: 4.75" H x 9.5" W x 5.5" D, 2.25 lbs.