<human>:  What should I do if my dog is aggressive?
<bot>: If your dog is exhibiting aggressive behavior, the first thing you should do is contact a veterinarian to assess and diagnose any underlying medical or behavioral causes. You may also need to work with a qualified animal behavior professional or a certified dog trainer to help you address the aggressive behavior and develop a plan of action. In some cases, anti-anxiety medication or obedience training may be recommended. Finally, be sure to also provide your dog with plenty of exercise and mental stimulation.