Mating is not bad, but make sure the other dog that you let your dog mate with is healthy, vaccinated and taken care of. Dogs can also contract sexually transmitted diseases from each other so it is important for us to make sure the partner is free of any diseases. If you are parent to a female dog it's also important for you to understand that the pregnancy and post delivery care is very important and you should be available for this. Also be prepared for a little upto 12 pups.