There are many different reasons in support of spaying or neutering your dog.  Among those reasons is the fact that they will be far less likely to bite.  Spaying and neutering will change hormonal levels in your dog, resulting in more docile behavior.    Your dog's instinct to wander or fight with other dogs will be reduced. Neutering your dog lowers testosterone levels, making male dogs less aggressive. Making sure that your dog is safely contained in his own yard is part of being a responsible pet owner. Keeping your dog in a limited and safe space will help protect not only your dog, but other pets and people as well.  Do not let your dog roam freely. Keeping your dog contained lowers the chance of them encountering and fighting other pets. Being kept secure will also lower your dog's chances of biting during a hunt. If you know your dog may bite, or suspect they may, avoid any unnecessarily stressful situations.  Do not introduce your dog to new or busy places.  Watch your dog's behavior at all times for signs of stress and leave the area immediately if you see them manifesting.  Don't introduce too many new people if that seems to be stressful for your dog. Large crowds can stress dogs out.  Try to avoid bringing your dog to these if they are nervous. Avoiding stressful situations works.  However, you may still want to train your dog to relax in them. Have a safe space where your dog can go and relax. Going to obedience training classes with your pet is one of the best ways to prevent dog bites.  These classes will teach both you and your dog how to work together to avoid biting.  Your dog will be socialized with other dogs and people. Your dog will learn how to deal with any fears it may have. You will learn how to properly reward or punish behaviors. Expect that both you and your dog will be learning. Ask your veterinarian for recommendations for good obedience training classes.

TL;DR in Chinese:
给狗狗做绝育。 不要让你的狗狗四处游荡，也不要松开狗绳。 不要让狗狗感到紧张。 和狗狗一起去接受服从训练。