Flea Allergy in Cats, Prevention and Treatment

Cat Flea Allergies and Prevention

by Debbie K
(Orange, Ca)



Our cat Kaylee is very allergic to fleas. When we first rescued her we thought she had a horrible disease and were ready to spend all kinds of money to get her back to health. When our Vet, Dr Doty, said she was allergic to fleas and all we needed to do was use a flea prevention product we were stunned. I had no idea that a flea allergy could do so much damage. At the time, Dr Doty also gave us a skin creme to use on Kaylee's sore areas.

All we do now is make sure we use Frontline Plus for Cats on her faithfully and the allergy is not a problem at all. It really is amazing how simple it is now!

Dear Debbie,

Thank you for sharing the adorable picture of Kaylee and for sharing your experience with treating cat flea allergies with other readers! I'm sure your story will give others hope for treating and preventing cat flea problems!

All the best,
Dr. Neely

Return to The Role of Cat Flea Medicine in Feline Allergies.

When to re-apply cat flea medication?

by Christina B
(Medford, WI)


I first applied Advantage for Cats to my cat Fred on Jan. 11. My husband threw away the instructions after I applied the medicine. When should I apply the next dose? Will it hurt to switch to Frontline? My vet said it didn't matter, but I want to make sure. The medicine did slow Fred down some from the fur pulling but now he is back at it.

Hi Christina,

Your vet is absolutely correct that switching between the two brands of cat flea medication is okay to do, but it is always smart to ask. Either Advantage or Frontline for Cats should be applied every four weeks.

All the best,
Dr. Neely

Return to The Role of Cat Flea Medicine in Feline Allergies.

Cat Back and Tail Hair Loss

by misha
(san juan, pr)

back and tail hair loss

back and tail hair loss


I have an adult cat that periodically loses hair. The areas where hair loss usually occurs are the back and tail.

This cat has no fleas or ticks. This situation appears from time to time, but is always present.

I sent you some pictures of the areas mentioned. If you have any advice or solutions, they are welcome.


Dear Misha,

Hair loss in cats is most often due to allergy and the most common allergy that cats get is flea allergy.

A cat can have hair loss and be allergic to fleas and you or your veterinarian may not find a single flea on the cat. This is because an allergic cat can have a reaction from only one flea bite. Also, cats that are itchy from a flea bite may be licking and therefore ingest the fleas.

The location of hair loss on your cat as shown in the photos is that area that is most associated with flea bite allergy. Even though there are other causes of hair loss in cats, I would recommend that you use Frontline or Advantage once monthly.

Again, just because you don't see any fleas, that doesn't mean your cat is not getting flea bites that are causing the hair loss. In fact, the cats that come into my hospital with flea bite allergy are the ones that almost always do not have any visible fleas.

Of course, the best thing would be for you to take your kitty to a veterinarian. Your veterinarian can give your cat some medication to relieve the itch while the Frontline or Advantage has time to work to get rid of all the fleas.

Your vet also can discuss other causes of hair loss in cats with you if they seem to apply to your cat, such as food allergy or allergy to other things in the environment.

Thank you for writing. You can find much more information about cat allergy and flea allergy on our website under the heading Feline Allergies.

Kindest regards,
Dr. Neely

Return to The Role of Cat Flea Medicine in Feline Allergies.