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Why does my dog's allergic reaction disappear at the vet's office?

Updated On September 23rd, 2025

Pet's info: Dog | Staffordshire Bull Terrier | Female | spayed | 6 months and 7 days old | 22 lbs

had spayed on day 4 woke up to Blue having a swollen eye took her to the vets and gave her some steroid n antiestmens all symptoms went for around 8 hours then returned with hives all over her body. Gave her some more antiestmens and failed to work was up till early hours with her Returned to vets Saturday day 6 still full of hives. As soon as we arrive at the vets all symptoms are gone. Then once we leave the practice all symptoms return. Back to vets again same again now hiding in dark place

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1 Answer

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Answered By Anna M., DVM

Veterinarian

Published on July 29th, 2017

Poor Blue! That is quite a swollen face :-( It's a bit unclear what the question is here, but a swollen face is usually a sign of an allergic reaction, and it's typical to treat with antihistamines and/or steroids, so it sounds like your vet is on track. Most allergic reactions resolve within a few hours, but I have seen cases have symptoms continue to return like you're seeing with Blue as the medications wear off, sometimes up to nearly a week. It sounds like you're doing everything right continuing to bring her in so the vet can respond to the symptoms as they happen - I understand it's frustrating! Hopefully it resolves soon. I would be hesitant to link her current symptoms to the spay, since allergic reactions usually occur much faster, and if her swelling started 4 days after her spay, that seems unlikely to be related. She may have been stung by a bee or had an insect bite that triggered it - but you vet may discuss altering her medications if they think there might be an association. I hope I answered your question - if you wanted input on something specific feel free to post again. Hope this helps!

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