1. Size selection: Dog collar size S: neck circumference 19 27cm, depth 20cm; M: neck circumference 28 37cm, depth 23cm; L: neck circumference 38 47cm, depth 25.5cm; XL: neck circumference 48 53cm, depth 28cm. 2. Breathable mesh: The dog collar is made of quality, breathable mesh fabric that allows air circulation around your pet's neck, providing maximum comfort and longlasting protection. Thanks to the transparent window design, dogs can wear the collar comfortably while maintaining a clear view. 3. Adjustable collar for dogs: This Elizabeth collar for dogs/cats features a practical hookandloop closure for easy and quick attachment and removal. The elastic band can be secured to your dog's collar for added stability, preventing slipping or loosening. 4. Bite prevention: The Elizabeth collar surrounds the dog's neck in a radial shape, restricting the movement of the dog's mouth. As long as the dog cannot reach from the front, it cannot bite a human no matter how it turns its head. Therefore, this collar is an effective tool for preventing dog bites—not only stopping dogs from biting people but also preventing them from licking or biting themselves.