If the Teddy's tail is not trimmed, it will keep dragging. Over time, the dog's tail may be injured, infected, etc. Tail docking is helpful for the growth and health of the Teddy. It is usually done 3-7 days after the dog is born. The longer the time interval between surgeries will increase the pain of dog tail docking, it is best to go to a regular pet hospital for examination and treatment when docking the dog's tail to avoid danger to the dog's life.