In humans, eating disorders are common, but it's not as clear when it affects your pet. A dog may eat more than necessary to meet its hunger, but it may also be starving itself to death. And while it's possible for dogs to have anorexia, it's unlikely that your pet will develop such an illness. Nevertheless, some dogs do experience eating disorders. If you notice that your pet has an unusually low appetite, it's likely that he's experiencing a disorder.