Anywhere from 2 to 24 hours.If longer than 24 hours call your vet.
My dogs first heat cycle lasted about 4 weeks.
56-63 days After mating!
Dogs are in heat for about twenty one days. There are three stages in a female dogs' heat cycle.
you wont know for sure. ask your vet.
sign to tell if your dogs in labor
When it menstruates
Female dogs go through a heat cycle, called estrus, every six months. She will have proestrus, or a bleeding cycle, before her true heat cycle during which she is very receptive to the advances of male dogs. This heat cycle lasts for several days up to three or four weeks. Some female dogs will undergo personality changes during this time, the most common changes being anxiety and irritability.
Dogs, no matter the breed have a heat cycle twice a year on average, lasting 20-24 days.
Female dogs go through a heat cycle, called estrus, every six months. She will have proestrus, or a bleeding cycle, before her true heat cycle during which she is very receptive to the advances of male dogs. This heat cycle lasts for several days up to three or four weeks.
It is the fertile section of their menstrual cycle.
no
You can't really give an average time for this, I'm afraid. All dogs are different, and it would depend on how many pups.