Small = (L) 3"; (W) 1.75" (Suitable for dogs up to 20lbs/9kg)
Medium = (L) 3.5"; (W) 2.25" (Suitable for dogs between 15-35lbs/7-16kg)
Large = (L) 4"; (W) 2.75" (Suitable for dogs between 30-65lbs/13-30kg)
Extra Large = (L) 5"; (W) 3.5" (Suitable for dogs between 60-90lbs/27-41kg)
Extra Extra Large = (L) 6"; (W) 4" (Suitable for dogs between 85lbs+/38+kg)