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How long is a dog's menstrual cycle?

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On average, a dog's entire menstrual cycle lasts about a half-year to two-thirds of a year, but extremes are four months and almost two years. For most of the time, a female dog's in anestrus, the resting stage of her menstrual cycle. For a period of a week to three weeks of the cycle, she's in heat. read more

After a relatively long period of reproductive rest, the "first" stage of a dog's menstrual cycle is the proestrus stage. Proestrus averages 9 to 11 days but can be as short as three days and as long as 21. Canine females have swelling in the vulva, and discharge. read more

The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time. read more

A dog getting her period is usually referred to as the dog “going into heat.” It usually occurs about twice a year, with the first cycle coming sometime between the time the dog reaches six months of age and her first birthday. Each cycle will last anywhere from 1 to 4 weeks. read more

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