How long does a dogs menstrual cycle last?

Your dog can come into her first heat any time between 6 and 24 months. According to Webvet.com, small dogs come into heat sooner than larger breeds. Typically she will have two estrus cycles, or heats, a year, and each one lasts for between 18 to 24 days. read more

Answers to female dog owners' common questions, from how long does a dog's period last to how to prepare for it. read more

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. read more