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Is it safe to apply cat flea medicine to their chin or neck?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 1 year and 8 months old | 10 lbs

My cat has a very minor case of fleas that we had believed were taken care of. When applying flea medicine we've put it behind her head and base of her tail, where they usually leave dirt. For over a month now there haven't been any signs of fleas, but we just found 2 on her and some flea dirt under her chin and under side of her neck. She'll be due for her next dose and a bath in about a week. Can I apply the medicine to the under side of chin & neck?

2 Answers

Most Helpful Answer

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Answered By Sarah Smith, Bsc (Hons) BVM&S MRCVS

Veterinarian

Published on January 10th, 2017

I would recommend that you avoid applying any spot on flea prevention product in any area that Delilah may be able to reach by grooming as ingestion of the product could make her unwell. Applying the product to the back of the neck only would be adequate and will keep her safe. You should note that over the counter flea prevention sold in supermarkets and pet shops is often ineffective and if you are experiencing a persistent or recurring flea problem I would recommend using a product prescribed by your veterinarian. I would also recommend treating your house for fleas using a product such as Indorex for example to ensure that there is nothing persisting in the environment that could be causing reintroduction of fleas to Delilah. It would also be recommended to use a product on a regular basis i.e. monthly for ongoing flea prevention.

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on

    No, it is not safe to apply the medicine to the underside of Delilah's chin and neck. Cats are exquisitely sensitive to flea medications, and it should only be applied to the back of their head to prevent her from ingesting it. When a cat has fleas, the environment has to be disinfected as well. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. You can give Delilah Capstar now. It's a one time pill that starts killing fleas in 30 minutes, and it's safe to give anytime. I'm not sure what flea medication you have used on her, but if it's something you got from a grocery store, those are not effective at all. If it was Frontline, I personally and other colleagues have seen resistance with it. I recommend using Advantage or Revolution next time. Only apply it to the back of her head, and do not apply it to the base of her tail, under her chin, or on her neck.

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