Every dog loves to chew and bite on everything, which is why this Ultra Sub toy is designed to make it hard to bite into the filling and thus keep your dog's attention for much longer. The Busy Buddy Ultra Sub dog chew toy is made of nylon and durable rubber with a vanilla flavor. With a top that you can unscrew, you can change the filling over and over again. You can choose from two sizes of the Ultra Sub dog bite toy, S (for dogs from 5 to 10kg) and M (for dogs from 10 to 23kg).