Mikki Muzzles Mikki Muzzles Allow The Dog To Pant And Drink.A Strong Nylon Muzzle Which Is Soft And Flexible. Adjustable Strapswith Quick-Fit Catch. Inhibits, Chewing And Barking But Still Allowspanting And Barking. Should Not Be Used During Strenuous Exercise Noseband Product Sample Of Breed Measurement CmSize 0 Yorkies, Cavalier Spaniels,Miniature Breeds 10Size 1 Whippets, Westies, Jack Russells, Dachshunds 12Size 1X1 Larger Size Of 1 13Size 2 Beagles, Springers, Cockers, Poodles (Std) 14Size 2X1 Larger Size Of 2 16Size 3 Labradors, Gsd, Dobermans, Retrievers 18.5Size 3X1 Larger Size Of 3 19.5Size 4 Wolfhounds, Great Danes, St. Bernards 24Size 4X1 Larger Size Of 4 28.5Size 5 Rottweilers, Bull Mastiffs 21.5Size 5X1 Larger Size Of 5 26.5Size 8 Boxer 30Size 10 Staff, Bull Terriers 22