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My dog in heat is vomiting and tired. Is this normal or concerning?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | unspayed | 8 months and 24 days old | 15 lbs

My eight month old dog started her first "period" last week and I have seen her vomit a couple of times or more with yellow foam. She also feels warmer than normal but when I check her temperature, it's their normal temp (38.6). She doesn't have energy recently, always sleeping and stays under the bed all the time. Is it normal for dogs to act like this during their "period"?

2 Answers

Most Helpful Answer

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Answered By Eve Pugh, DVM, CVA

Veterinarian

Published on August 28th, 2017

Dogs can feel lethargic and not want to eat during their heat cycle especially their first one. However, this shouldn't last long. Vomiting is a bit unusual for a heat cycle. She should get a physical examination by a veterinarian to make sure she doesn't have gastroenteritis or pancreatitis.

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Other Answers

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    Answered By Ana M, DVM

    Veterinarian

    Published on January 26th, 2020

    Thank you for submitting your question regarding your puppy. A heat cycle can change a dog's behavior, but it is not normal to be as lethargic as you have described. Most dogs do not vomit either. I recommend that she sees her veterinarian to ensure that she is not sick. You do not want to overlook an illness by blaming it on her cycle. I hope this information helps!

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