A bite prevention implement, wherein the bite prevention implement is made with a flexible fabric and is provided with a cord and its covers, which has a function of adjusting the width of the fabric for the length of an animal's lower jaw, the bite prevention implement is made with a flexible fabric and is provided with a cord and some loops, which has a function of adjusting the width of the fabric for the length of an animal's lower jaw, and further, the bite prevention implement is made with a flexible fabric and is provided with provided with a cord and some holes, which has a function of adjusting the width of the fabric for the length of an animal's lower jaw.