How long do girl dogs stay in heat?

Heat usually lasts between 2-4 weeks. Early in the cycle, a female dog may not be receptive to male dogs, although some are receptive through the entire cycle. It can be shorter or longer and you'll know the cycle is over when all her vulva returns to its normal size and there's no more bleeding or discharge. read more

Non-spayed female dogs will normally go into "heat" or estrus twice a year. The age at which their cycles start and the duration of the cycle vary greatly between the breeds of dogs and individual dogs. If you are planning to breed your dog then you'll need to learn their estrus cycle in order to make the most use of your breeding time. read more

The average cycle for a female dog in heat happens about once every six months, typically between January and March and again between August and October, beginning when a dog reaches about 6 months old. There are four different stages for the estrus (heat) cycle. read more

The heat cycle of the female dog has three parts and lasts about 3 weeks. The first part lasts anywhere from 3-14 days during which a bloody discharge and swelling of the vaginal area are usually seen. read more