Would you give him a hand?

Most pet parents don’t enjoy dogs who bite, chew and mouth their hands, limbs or clothing during play and interaction. The jaws of an adult dog can cause significantly more pain than puppy teeth, and adult dogs can inadvertently cause injury while mouthing. Mouthing is often more difficult to suppress in adult dogs because adults aren’t as sensitive to our reactions as puppies are, and they’re usually more difficult to control physically because of their size.

Adult dogs who mouth people probably never learned not to do so during puppyhood. It’s likely that their human parents didn’t teach them how to be gentle or to chew toys instead.