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Can I use Seresto on my cat after Frontline and a bath?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Male | neutered | 9 lbs

I put Frontline Plus on my cat 6 days ago. However, the fleas didn’t go away. I gave him a bath yesterday with Dawn dish soap, but the fleas immediately came back. I just went out and got a Seresto collar. Can I put it on my cat now?

3 Answers

Most Helpful Answer

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Answered By Rodrigo Roca, DVM

Veterinarian

Published on November 4th, 2018

Hello, thank you for your question about Jumi. Yes it is safe to put the Seresto collar on him now. One of the challenging aspects of flea preventatives is that in order for many products to work the flea has to bite, this is when they are exposed to the active ingredient and this leads to death. Therefore, just seeing live fleas doesn't mean the product isn't working. A very important part of the treatment of fleas is treatment of the environment. I would recommend purchasing a carpet shampoo that is specifically designed to help with flea treatment. If the collar does not treat all of Jumi's fleas I would recommend contacting your veterinarian to discuss the need of an additional flea treatment, such as Capstar. This helps to quickly kill any adult fleas on the cat. Hope this helps, good luck!

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Other Answers

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    Answered By Andrea M. Brodie, DVM

    Veterinarian

    Published on October 25th, 2018

    You can put the collar on. However! 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:  1) Get some flea medication such as a Flea spray or a spot on from a pet shop or your veterinarian and apply monthly 2) get flea powder, put some in your vacuum cleaner bag and vacuum your house and furniture and also non-carpeted areas frequently to remove flea larvae and eggs which live off house dust., Dispose of the bag in the trash outside. Hot-wash all the pet's bedding, If you do this diligently for a few months you will get rid of the fleas. Flea products: Spot-ons and/or chews Advantage, Advantix 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) House spray: Indorex

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on August 17th, 2017

    Hi! Thanks for using Petco Pet Education Center, formerly Petcoach! Dealing with fleas sometimes can be quite stressful. I would give Frontline a bit longer to work. I would focus more on the other things you can do to help get rid of the fleas such as vacuuming the house and all the surfaces they have contact with frequently (every 2-3 days). If no improvement after a month or so, you may consider a different flea preventative. Goodluck!

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