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New cat has fleas. How long to get rid of them? Should I quarantine?

Updated on September 23rd, 2025

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

I just got my cat. He’s about 4 months old. I brought him home and realized he has fleas. I used sentry drops, got a flea collar, and I’m using vets first flea spray and rubbing it in his fir. I’ve gotten a lot of them out within the 24 hours I’ve had him. How long will it take to get rid of them? I also have him quarantined right now so he does get them on anything. He hasn’t been here yet so there’s no fleas and I want to kill them before I let him out. Is that okay to do?

1 Answer

Most Helpful Answer

Andrea M. Brodie, DVM

Answered By Andrea M. Brodie, DVM

Veterinarian

Published on October 28th, 2018

Unfortunately fleas only hop on the body of your pet when they want to feed, then they hop off again and stay in your pet's environment. So you need to treat all pets in the household as well as the environment (which contains the fleas, their eggs and larvae).
Flea treatment: 
Get some flea medication such as a Flea spray or a spot on from a pet shop or your veterinarian and apply monthly
Flea products:
Spot-ons and/or chews
Advantage,
Advantage Multi (Advocate in the UK)
Frontline (ticks as well)
Bravecto spot on (ticks as well) - for cats, in tablet form for dogs
Simparica, Nexgard
Revolution (stronghold in the UK)
Tablets: comfortis (will only kill fleas once)

Collar: Seresto (ticks as well)
Vote Icon1Pet Parents found this answer helpful

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