Because when two dogs mate, the male dog’s balls will enlarge after entering the female’s body, locking the two dogs’ butts together, making it impossible for the outside world to pull them out. The only way to do this is to wait until after mating. The eggs will come out on their own as they become smaller, and the two dogs cannot be separated artificially. When dogs are mating, it is not taboo to forcefully separate the two dogs. Doing so will cause great harm to the dogs and may even lead to death. If the dog at home does not want to mate when it is in heat, it is necessary to wear physiological pants and stay away from the opposite sex.