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My dog has red lumps on belly after allergy treatment. What are they?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | spayed | 13.22 lbs

Our dog has been to the vets today with a query allergic reaction. She had a steroid injection and seemed to get worse, she has since been in and received an antihistamine injection and the facial swelling has gone down however she now has developed these red lumps on her belly and legs. She is due a piriton tablet in the morning. What are these red lumps and should there by any concern. We are not sure if it's an insect bite or not which could be the cause of the facial swelling.

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on October 6th, 2017

These do indeed look like part of an allergic reaction (wheals/hives) and generally settle down after 12-24hours. Monitor closely for any internal complications such as vomiting, diarhhea, panting or weakness from an increased heart rate which may require hospitalisation and intravenous fluid drip. It can be difficult to identify the original trigger allergy bloods and a hydrolyzed diet such as royal canin anallergenic should be considered if recurring often

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