Dog behavior issues are common in puppies and can quickly be fixed through proper training at a young age. Providing positive reinforcement and setting boundaries for your dog will lead to a happy relationship between you and your pet. Dogs feel more comfortable when boundaries are set and they know what is expected of them. If you are dealing with a current behavior issue, there are ways to change your dog's behavior, regardless of age. Options include hiring a professional dog trainer, doing your own behavior modification, or changing your dog's environment to solicit a positive, wanted behavior. Learn to recognize triggers, get tips and advice below.