How Long Does A Dog In Heat Bleed. With dogs in heat, each dog heat cycle lasts 3 to 4 weeks , but you will only see bleeding during the first 2 weeks. Does a dog bleed the whole time in heat?
This phases lasts seven to 12 days. Some dogs bleed very heavily and others so lightly that it’s barely noticeable. From the beginning of the heat period, she will be attractive to male dogs, but will usually not be receptive, or allow mating until about 7 to10 days into the cycle.