There are many reasons why Teddy's tail is docked. First, Teddy's tail is relatively thin, the bones are very fragile, and it is easy to be injured, so it is easy to fracture. Second, Teddy was originally a hunting dog. Having a tail will cause difficulty in movement and affect hunting. Third, for hygiene reasons, Teddy's hair is relatively long, so it is easy for dirt to stick to it. After docking the tail, it is easier to check whether there is any foreign matter in the anus. Fourth, for the sake of aesthetics, Teddy was originally named Poodle. It was called Teddy because it looks like a teddy bear. Docking the tail can make Teddy look more like a teddy bear.