How To Tell If A Dog Is In Heat. If her heat cycle ends, her nipples begin to swell, and she shows less interest in food within the first week or two after the suspected mating, contact your veterinarian as there’s a strong chance she is now pregnant. Frequent urination in the presence of male dogs
During this period, bleeding occurs, this alerts owners so they know that the heat cycle is near. Standing/moving the tail to one side when touched, What stage of heat is my dog in?