When your dog is out, never leave her unattended for a moment. It only takes a minute for a male to mate your female. To discourage males from coming to your house, if possible drive your dog to a vacant field or park away from your home to relieve herself. Also be careful of males wanting to mate. Even the most docile male may become aggressive.
Cats Cats are extremely hard to detect when they start their heat cycle.
They will cry, roll around, and become very lovable. You'll also notice a lot of male cats. Remember, females can have several heat cycles a year. My advice is the same as for dogs if possible. Remember it is your responsibility as a pet owner to help control the problem of so many unwanted animals.