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My dog is vomiting after vaccine reaction. When to see the vet?

Updated On September 23rd, 2025

Pet's info: Dog | French Bulldog | Female | unspayed | 36 lbs

My dog had a booster for Lepto two days ago. She had a severe allergic reaction 8 hours after vaccine. She is still vomiting any food she eats, though hives have finally disappeared. At what point do I return to her vet? She has a history of allergic reactions to vaccines. She is a french bulldog.

2 Answers

Most Helpful Answer

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Answered By Mirissa Duncil, DVM

Veterinarian

Published on August 2nd, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! I would recommend taking her in now-they can give medications to lessen the effects of the reaction as well as anti nausea and vomiting medications to help her be more comfortable. Request that they premedicate your pet for vaccine reactions the next time and it may help dampen the effects before they get started. I hope this helps!

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Other Answers

  • Published on

    If she is fine in herself now (a part from the vomiting), I would suggest to withhold food for the next 6 hours and then start feeding with a bland diet based on boiled chicken and rice in small portion every 6 hours for the following 48hours. Then gradually reintroduce the normal diet over 5 days. I would definitively recommend a veterinary check up if the signs persist or you notice diarrhoea, lethargy or inappetence. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

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