Paw Ready Bite Block Toothbrushing Aid helps access you're Dogs and Cats Teeth to Allow Easier Brushing. Designed to allow you to brush your puppies, dog, or cats' teeth without constantly worrying about getting bitten. Unique natural rubber design protects your fingers while gently probing your puppies, dog, or cats' mouth open to allow for brushing. The Small Size is recommended for use with Dogs and Cats between 5-15 lbs. (2-7kg) and Is Safe for Puppy’s 28-baby teeth. Medium size is recommended for use with puppies, dogs or cats between 15-85 lbs. (7-38kg).