ADJUSTABLE AND SECURE: The dog muzzle is adjustable, and the leather neck strap is easy to wear and install. 2 or 3 metal buckles on the muzzle to prevent the muzzle from falling off and provide your pet with company a comfort ultimate when you wear it. Comfortable and Breathable: The soft muzzle is made of breathable PU leather, making the dog feel more comfortable and free when running indoors or outdoors. This sturdy but lightweight material can reduce the weight of animals company. Protection: Using the muzzle can effectively prevent dogs from barking, biting, chewing, eating unclean food and hurting others. Help them form good habits and stay in shape. Size: xs Drink freely Breathe easily while sleeping Eat barrier-free foods.Size: Mouth tip circumference, middle mouth circumference, back of head size, weight referenceXS 10-13cm 13-17cm 10-32cm 3-10cattyS 14-18cm 18-22cm 10-38cm 8-25cattyM 19-22cm 23-27cm 20-43cm 20-50cattyL 23-26cm 29-33cm 20-45cm 25-75cattyXL 28-33cm 32-40cm 30-50cm 75-110catty