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How long for Frontline to work

Species: Cat
Breed: Tabby
Age: 5-8 years
An older cat has been living under my porch for a while. I am interested in bringing her inside because a neighborhood dog tries to bite her and chases her, but I know she has fleas and I have another cat. I gave my cat (indoor only) Frontline, and I treated my rugs/base boards/furniture with flea repellent. I'm taking the outdoor kitty to the vet next week to have her checked out. What can I do to make sure my home and my indoor kitty remain flea free when I bring the outdoor kitty in? What will my vet do for her? Will frontline really kill all of her fleas? And if so, how quickly? Thank you!

Related Article: How to get rid of fleas!


Online vet, Dr. Marie

Dr. Marie replied:

Hi and thanks for your question!

You are doing all of the right things. Frontline is a very good flea product. Once applied, Frontline will kill all of the fleas within 12 hours. So, you may want to wait for 12 hours before you bring her in the house.

Another idea is to ask your vet to give her a tablet of Capstar when you are there (along with the Frontline). The Capstar will kill the adult fleas almost instantly. And then the Frontline will have residual effect.

It is very important that you treat both cats with Frontline a month from now and two months from now. That way, if any eggs fall off of the new kitty and land on the floor, when they hatch they will be killed right away. These eggs when they hatch will immediately seek out a cat or dog and one they get on a treated animal they will die.

It is also important to note that if you have any other animals in the house that they need to be treated monthly as well.

Hope all goes well!

Dr. Marie



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Disclaimer: Although Dr. Marie is a qualified veterinarian, the information found on this site is not meant to replace the advice of your own veterinarian. AskAVetQuestion.com and Dr. Marie do not accept any responsibility for any loss, damage, injury, death, or disease which may arise from reliance on information contained on this site. Do not use information found on this site for diagnosing or treating your pet. Anything you read here is for information only.

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Dr. MarieDr. Marie is a veterinarian who practices in a busy animal hospital in Ottawa, Ontario. She created Ask A Vet Question as a resource for good, accurate veterinary advice online. Dr. Marie treats dogs, cats, hamsters, guinea pigs, and rats. She has been a vet since 1999.

Is an online vet visit just as good as a trip to your veterinarian? No! But, many times, asking an online veterinarian a question can help save you money. While Dr. Marie can't officially diagnose your pet or prescribe medications, she can often advise you on whether a vet visit is necessary. You can also ask Dr. Marie for a second opinion on your pet's condition.