Currently, the commonly used emergency contraceptive pills for dogs in the world are diethylstilbestrol and estradiol cypionate. These two drugs cause the dog's body to produce a large amount of estrogen in a short period of time, preventing the fertilized egg from entering the uterus.

But like emergency contraceptive pills used by humans, their side effects are very serious, or even worse. Many organizations have found that female dogs can experience many side effects after ingesting estrogen medications.

If the dog is accidentally bred, the owner can choose to take the dog to the hospital for sterilization surgery, or wait for the dog to give birth. If the owner has no need to breed the dog, he can directly perform sterilization surgery, so that the dog will not give birth and the risk of the dog suffering from reproductive system diseases will also be reduced.