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Related Topics. If you suspect your pet is sick, call your vet immediately. For health-related questions, always consult your veterinarian, as they have examined your pet, know the pet's health history, and can make the best recommendations for your pet.
Article Sources. The Spruce Pets uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Read More. When does heat start? How long is each cycle? Is this a lifetime thing? Share a few contact details to get your FREE e-book. Dogs exhibit all sorts of bewildering, funny, and sometimes worrisome, quirky behaviors. Ever wonder what he's thinking and where the behaviors come from? Download this e-book to find out. AKC Privacy Policy. Founded in , the not-for-profit AKC is the recognized and trusted expert in breed, health, and training information for all dogs.
AKC actively advocates for responsible dog ownership and is dedicated to advancing dog sports. All rights reserved. The heat is on! During this time she is receptive to mating with males. Her estrogen levels first increase and then decrease drastically and eggs are released from her ovaries. She might also produce a bloody discharge from her vagina. Unspayed female dogs generally first go into heat between the ages of months old. First estrus tends to happen earlier for small dogs and later for bigger dogs.
While frequency varies according to breed and individual dogs, usually dogs go into heat about twice a year or every six months. Each estrus period lasts about 18 days.
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