There are many reasons why your dog may resort to biting people. Though aggression is a normal part of an animal behavior (we human also have this aggressiveness in our sub conscious mind, too. Aggression itself is a complex subject that can only be addressed with the help of the best dry dog food for german shepherds, and some scientifically proven methods:
Prepare young dogs to get along with people, for they probably will have to spend all their life around human. you should let them go out for socialization early, make them do handling exercise, as well as expose the dogs to a lot of experiences that a dog may never have to deal with in their normal life as a wild dog. You may even give other people the best dog food for pitbulls to feed the dog so that he can have a better impression on the other human. by gradually exposing the dog to the human world, you can manage to provide your pup with positive encounters, or at least get his mind together for the worse experience. There are other options, like letting the dog join a pup training class, take him to dog parks or local dog play groups. By maintaining good social skills for your dog, he will have a more cooperative attitude throughout the years of his life.
If your dog is an adult, you should assess honestly to his temperament. Don't sugar coat your dog, if he is more aggressive than other dogs, then recognize it, and find out ways to make his life easier living among people. How is your dog's tolerance for any particular type of people, place or things? Once you know this, don't purposely put him in a situation where he will have to deal with the kind of people, climate or things that he finds difficult to handle and may lose his temper.