Even the best behaved dog will sometimes need a muzzle.
This flexible plastic basket muzzle has a forehead strap to help prevent the dog from getting the muzzle off.
This muzzle is made for dogs with short wide snouts.
The size 4 muzzle is 14" around.
The length on the size 4 is 2-1/2" on the top and 4" on the bottom.
The size 5 muzzle is 15" around.
The length on the size 5 is 3" on the top and 4-1/2" on the bottom.
Measure the dogs length and circumference of his snout.
Add 1 to 2 inches to the dogs snout circumference.
This is a plastic muzzle and will not hold up very long on a untrained aggressive dog.