Is Your Cat Allergic to Her Food?

Your cat has developed a red sore on her back – could food could be causing it?

Cat Channel guest author Arnold Plotnick, DVM, notes that, “Many cats with skin allergies will develop a large circular red sore on their back, often right in the middle of their back in the shoulder blade area. Often, the sore will ooze a little serum, and it can sometimes become infected. These are similar to “hot spots” that commonly develop in dogs.”

A few things can cause them:

  • Inflammatory or Auto-Immune Condition Anti-inflammatory medication — steroids such as prednisolone, a synthetic version of cortisone — often cause the sore to resolve. I personally prefer to prescribe tablets rather a steroid injection, as I feel it is safer. Steroids didn’t work, so an inflammatory or an auto-immune condition seems unlikely.
  • Bacterial Infection If a secondary bacterial infection develops, it might need antibiotics. Antibiotics didn’t work, so an infection is unlikely.
  • Flea Allergy Cat flea allergy can certainly cause scabs throughout your cat’s skin, but usually doesn’t cause a persistent open sore. Flea treatment didn’t help, so fleas are unlikely to be the cause.
  • Food Allergy Cat food allergy can present in a variety of ways, although a persistent sore is not your typical presentation. I’m surprised that the steroid injections had no effect. The next step is to determine whether your cat has a food allergy.

How to Determine Whether Your Cat Has Food Allergies
•    Start a hypoallergenic diet. A hypoallergenic diet contains a protein source that your cat has not been exposed to before, such as rabbit, venison or duck. (Most veterinarians carry prescription diets designed for this purpose.)
•    Feed this food, and ONLY this diet, for up to 10 weeks, before concluding whether or not food allergy is the culprit.
•    Alternatively, you may opt for a skin biopsy. This simple procedure will very likely reveal the diagnosis.

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