Amateur chewing dogs are typically very young puppies or very old dogs. Dogs that tend to have weaker teeth.

Average chewing dogs are usually dogs that take their time chewing. They try to get the most from their chew to get the best experience.

Aggressive chewers are the dogs that try and destroy whatever it is they are chewing on. They don't have to get any enjoyment from their chew, just so long as they are chewing.