It's perfectly normal for a puppy to exhibit some nipping and biting behaviors. A puppy's mouth is his way of exploring the world around him. However, as a puppy heads into adolescence, when the behavior is not curbed, it can become a serious problem. Your dog should not exhibit any growling or unwarranted mouthing as he gets older. This can be a sign of dominance issues and requires immediate attention to nip it in the bud before it becomes serious. If your dog becomes aggressive or bites, get a trainer or animal behaviorist to assist you in correcting the problem.
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