Extra Small

Dimensions: Neck = 8", Chest = 11", Length = 8" - 10"

Small

Dimensions: Neck = 9", Chest = 14.5", Length = 11"

Medium

Dimensions: Neck = 12", Chest = 17", Length = 12"

Large

Dimensions: Neck = 15", Chest = 22", Length = 14" - 15"

Extra Large

Dimensions: Neck = 17", Chest = 24", Length = 18"