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How long should I expect my female dog's heat cycle to last?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed | 7 months and 15 days old | 10 lbs

how long is a female in heat

1 Answer

Most Helpful Answer

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Answered By Ana M, DVM

Veterinarian

Published on November 16th, 2018

Thank you for submitting your question regarding Marshmallow. A heat cycle in a dog will typically last about 2-3 weeks. She will not be receptive to males during this entire time period. However, I would keep her away from intact males until you are sure her cycle is complete so there is no chance of an unplanned pregnancy. At this time, the discharge will resolve and her vulva will no longer be swollen. I hope this information helps!

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