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Why is my dog throwing up after getting allergy injections?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 1 year and 11 months old | 90 lbs

A day and a half ago, our 90lb, 2 year old yellow lab male developed hives - pretty extensive - from a suspected insect bite/sting. It was the middle of the night, so we took him to the Animal ER. They gave him injections of dexamethasone, diphenhydramine, and famotidine. We were told to give him 3 Benadryl every 8 hours starting 8 hours after we left the clinic. I have done this. Since then, he has vomited his food a couple of times. (He sometimes does this anyway). An injection reaction?

2 Answers

Most Helpful Answer

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Answered By Emily, DVM

Veterinarian

Published on June 21st, 2017

It could be a reaction but could also indicate stomach irritation from the steroid injection. Sometimes a bland diet like white rice and boiled chicken helps for a few days but if the vomiting continues, he has bloody diarrhea, seems painful of weak Murdoch needs to be rechecked by a veterinarian to make sure nothing more serious is causing his symptoms.

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    Answered By Megan, DVM, CVA

    Veterinarian

    Published on

    He is likely not a reaction to any of the injections that they gave him. You can increase the Benadryl to 100mg of Benadryl every 8 hours. You can also give 20mg Pepcid to help his nausea. If he isn't better by tomorrow I would call your vet to ensure there is nothing additional going on.

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