DOG FAQ - Do Mastiffs Chew?

As for chewing, puppies of any breed need to be given durable toys that they know it is OK to chew. Any time you catch your Mastiff puppy chewing on anything except its own chew toys, take the forbidden item away from it, and give it a chew toy, and encourage the dog to chew on its own toy. Praise it when it DOES chew on its own toy. Repeat as necessary (remember, we told you these dogs are stubborn!)

Mastiff - Dog Lover