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It rides up to my dog's eyes which is unfortunate. Also the mouth opening is a little too wide so it almost defeats its purpose. If you are purchasing this to prevent a dog bite, choose something else. Your dog can open its mouth just enough to nip at whatever comes near. (I have a tall, large dog-- over 80lbs.) While the muzzle startled her because it is closed on the sides, once she realized that it was open in front, she put on a show trying to eat whatever she could grab in the garden.
I ordered a 5 X which in other venues indicates a very large muzzle. This muzzle might fit a small lab or hunting type dog. I have a St Bernard. I was very disappointed. Will return. Unsure if my account will be credited.