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My cat has fleas, Sentry failed. What's a fast, safe flea treatment?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 14 lbs

One of our cats has fleas (both do obviously, but one has more than the other) and we’re trying to figure out what to do since we used Sentry Purrscriptions Plus on them, and it hasn’t been effective. We don’t want to combine medications and make them sick, but also don’t want them to have fleas for a month. Right now on hand (we’re in a part of the US that is currently experiencing high floodings - flooded in with fleas! Yay!) we have Hartz flea collars and normal pet shampoo.

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1 Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on September 17th, 2019

Over the counter Hartz and Sentry products do not work. I suggest you get prescription strength flea medications. You can easily get these medications from one of our VETCO clinics inside Petco stores. Here are the ones in your area: ( https://www.vetcoclinics.com/services-and-clinics/clinic-locations-and-schedules/?zip=77081 ) Take the cats with you. It is first come, first serve and there is no exam fee so just the cost of the products. The vet there can advise you when you can give the new product based on when you applied the other product. You also need to treat your house and yard (if you have one for fleas). I suggest these products: ( https://www.allivet.com/p-1389-knockout-es-area-treatment.aspx ) ( https://www.allivet.com/p-9065-vet-kem-yard-spray-32-oz.aspx?SearchTerm=yard%20spray+Auto ) Hope this helps. Best wishes.

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