- The dog collar buckle and the D-shaped dog leash hook are made of zinc alloy. The collar is built to last 2. Made of high density polyester and nylon material which results in this dog collar’s strength and durability, unlike other cheap pet accessories that end up letting you down 3. The collar is not elastic, please determine the size of the dog. A proper collar and harness will leave no room for your dog to chew 4. Soft fabric padded dog collar. Comfortable to wear and protects your dog’s neck