How many days is a dog 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

The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. The estrus period length varies widely between breeds and individual dogs. The length of a cycle varies widely, even for dogs of the same breed. read more

A female dog will generally stay in heat for about three weeks or around 21 days. However, this heat cycle will vary from one dog to the next. It depends on the breed, the age and the dog herself. read more