KONG® Chew Resistant Dog Collar Ultra Durable Black Size XL NWT! Brand New Sealed Smoke Free Environment FIRM ON PRICE This KONG Chew Resistant Collar is strong, study, and durable. This collar is fully adjustable for optimal comfort, and stands up to chewing because of its strong thread. Built to last, this is on collar you and your dog will love. Ultra-durable Exceptionally strong thread Snap buckle collar D-ring Adjustable