The best way to stop a dog from chewing is to provide them with appropriate outlets for their chewing needs, such as chew toys or bones. Additionally, make sure that the dog has plenty of exercise and mental stimulation to help them stay occupied. If the dog is chewing on something inappropriate, it is important to redirect their attention to something more suitable. If the problem persists, it is best to consult with a veterinarian or animal behaviorist for more advice.