Allergies in Cats

Cats commonly develop allergies.  These include flea, food, and environmental. Environmental allergies can often be further divided into contact and inhalant.

Flea allergies are very common in cats. Even one bite from one flea can trigger an immune reaction in cats. These cats can develop severe itching causing the cat to chew or bite at its hair leading to hair loss. This hair loss often occurs just in front of the tail. Scabs are often seen over the head and neck. Strict flea control is the best way to prevent a potential flea allergy. 

Food allergies are also common in cats. Cats will develop allergies to the protein they have eaten for their lifetime. These include chicken, turkey, pork, and beef. Clinical signs include gastrointestinal disease such as diarrhea and vomiting, itching, and increased debris in the ears. Unfortunately, there is not a great test for food allergies and diagnosis is usually made by completing a food trial. A food trial must be extremely strict meaning no treats or table food. The cat must eat only this diet for a long period of time (it can take up to 12 weeks to see a response). 

Environmental allergies

Cats can be allergic to the same types of inhaled allergens as people! These include tree pollens such as cedar, ash, or oak, grass pollens, weed pollens (especially ragweed), molds, dust mites, and yeast. Cats can even be allergic to themselves and dogs! Some allergies occur seasonally while others are year around. Cats often develop severe itching. 

Treatment of allergies depends on the length of the cat’s allergies and if these occur seasonally. 

Some cats will require desensitization with specific antigen injections (allergy shots). I personally have two cats who are receiving these injections. These injections may take several months to show any improvement and typically need to be continued for several years. Steroids are another option to block the allergic reaction. There are several side effects of steroids, but the benefits typically outweigh the side effects. Antihistamines may also be used but are typically ineffective. 

Below are a few photos of my cats and their allergies. If you have any questions or concerns, contact your local veterinarian!