*** These are NOT going to fit a 10-20lb small dog like a yorkie!! *** **These are also Probably NOT going to fit BOXY muzzle dogs like American Bulldogs, Boxers, Cane Corso Etc.. See Dimensions below and measure your dogs muzzle to know if it will work.. Width is the most important to check 1st.** Full Grip Supply Kennel Muzzles are truly one of a kind - with a built in noseband, and added foam, they truly are unique - not to mention "Unbreakable”!! They fit a variety of breeds on long or short muzzles. They are made from molded plastic and with a Biothane head strap that is completely adjustable. Made in the USA!!! Medium INSIDE Dimensions 2.75" Width 4.75" Height 4.5 Length 11" Inside Circumference ( If when you take a soft tape measure around your dogs closed muzzle you don’t have at least a couple inches of space for them to open and pant this muzzle will not fit. ) Large INSIDE Dimensions 3.0 Width 5.25 Height 4.5 Length 14" Inside Circumference (If when you take a soft tape measure around your dogs closed muzzle you don’t have at least a couple inches of space for them to open and pant this muzzle will not fit. ) Muzzle Lick / Stool Guards now available here!!! (sold separately) https://www.etsy.com/listing/1016400614/full-grip-supply-muzzle-lick-stool-guard?ref=shop_home_active_1 Muzzle Strap Extensions now available here!!! (sold separately) https://www.etsy.com/listing/1400517280/full-grip-supply-basket-dog-muzzle-strap?click_key=cb12ef2150724fbcd393c2faf5ca5331d551bcce%3A1400517280&click_sum=d5adaf83&ref=shop_home_active_1 Features: Unbreakable Molded Plastic Genuine Biothane Headstrap Waterproof, Mildew Resistant, Easily Cleaned Fits Many Breeds Made in the USA