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Why is my dog acting strange after recent vaccines and medication?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | 1 year and 5 months old | 62 lbs

My dog got his rabies and bortella shot yesterday and also Heartworm and flea medicine (for the first time in a while) today he can barely stay awake, he won’t eat at all, when he does get up his head is twitching to one side, and he’s getting snappy with the other dogs. Could this be caused by the shots?

1 Answer

Most Helpful Answer

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Answered By Ana M, DVM

Veterinarian

Published on September 23rd, 2018

Thank you for submitting your question regarding Morty. He may be painful at the injection site from his vaccine. I would contact his veterinarian in the morning if his symptoms persist. The vaccines can produce lethargy as well. In the meantime, keep him quiet and separate from the other dogs to allow him to rest. I hope this information helps!

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