How Soon Can a Puppy Have Her First Period?

by Melodie Anne Coffman Google
    Her peculiar behaviors can let you know estrus is coming.

    Her peculiar behaviors can let you know estrus is coming.

    Russell Illig/Photodisc/Getty Images

    If you don’t get your new addition spayed right away, she’s going to start having heat cycles, known as estrus. Once she "gets her period," as it were, you’ll want to keep her away from other dogs. Otherwise, she's bound to get pregnant and present you with a litter.

    The exact age your fur pal will have her first period depends on her breed. It can happen anywhere from 6 to 24 months of age. Usually it occurs at the earlier end of the range for small breeds -- Chihuahuas, Yorkies and miniature poodles, to name a few. But large-breed pups, including boxers, bull mastiffs and Great Danes, among others, get their first heat much later on. Each dog is different; your veterinarian can give you a better idea when to expect the first estrus.

    Check your puppy’s hind end. Her vulva will swell dramatically as her first heat approaches, and you’ll see a bloody discharge. Before this, she may pee more than normal and seem skittish. These cues let you know her hormone balance is shifting and she is gearing up to breed.

    The heat cycle lasts about 18 days. She’s most fertile approximately 12 days after the bleeding starts. As the cycle comes to a close, the discharge slows and turns pinkish.

    Photo Credits

    • Russell Illig/Photodisc/Getty Images

    About the Author

    Melodie Anne Coffman has been writing for various online and print publications since 1996, specializing in human and animal nutrition. After receiving her master's degree in food science and human nutrition, she opened up her own nutrition consulting business in the New England area.

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