Puppy mouthing, biting, grabbing at limbs and clothing, are natural behaviours as they try to make sense of the world around them, but their teeth are needle sharp and can do damage to skin and to clothing, and you do not want your puppy growing up into an adult dog thinking that using their teeth on a person is acceptable. As well as being unpleasant and potentially worrying to the receiver, this could have serious consequences in terms of the law. This mouthing behaviour needs ‘nipping’ in the bud.