- Neck 14.5"-20", 3/4" wide, medium size; the collar will not stretch on its own, make sure to leave only 2 fingers between the collar and the dog’s neck. proper collar and harness leave no room for your dog to chew 2.The collar is not suitable for a tie.Never leave your dog unattended with a collar The charm attached to the ring in D is an accessory that adds style 3. Made of high-density polyester and nickel-free coded D-rings.Eco-friendly plastic buckle All photos are taken using our product samples. production, 4. Please measure your pet carefully to ensure proper purchase.