How long are dogs in heat?

How long do female dogs on their period last? When do they stop?

  • Vetinfo

    By: Jessica Mathis El Segundo, CA

    Replied on 04/19/2011

    The heat cycle of a female dog generally lasts about 3 weeks, although this can vary for each individual dog.  Their cycle is much different than a human's cycle in many ways and the bleeding you are seeing in your dog is not actually a "period".  The VetInfo website has a couple of good articles on the basics of the canine heat cycle.

    Once the 3-week cycle is completed, most dogs will not come into heat again for about 6 months.  If you are not planning to breed your dog it is important to keep a close eye on her during her heat cycle as she will be very attractive to male dogs.  The best thing to do for a female dog you don't plan to breed is to have her spayed so you don't end up with unwanted puppies.  Female dogs who are not spayed are also at risk for mammary tumors or a uterine infection called pyometra.

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