Petco Text Logo
Petco Pet Logo

My dog has spreading, crusty hives. What could be the cause?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Female | spayed | 10 years and 7 months old

My dog has come out in lumps like hives on her left hand side they are now gradually spreading the old ones have a crust now but they arnt bothering het

1 Answer

Most Helpful Answer

Image profile

Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on June 19th, 2018

This is probably caused by an allergic reaction. first of all make sure you de-flea Ellie regularly every month with a high quality spot on (ex. Advantage) as fleas are by far the most common reason for these reactions. If the fleas are not the problem, it could be an allergic reaction to food or an environmental factor. this is more complicated to treat and will sometimes require medications such as Steroids, anti histamines or cyclosporin in order to stop the allergy.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored