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Dog has fleas despite Seresto. How to clean house & treat him?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 1 year and 2 months old | 15 lbs

We took riley to a pet sitter last weekend, and today we found 4 fleas on him. I couldnt find any more than 4, but he has the “flea dirt.” How much should we freak out, and what is the best way to clean the house so that there are no eggs? He wears the seresto collar, what other treatment do you recommend?

2 Answers

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 11th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! The good thing is that there are many things that can be tried to help in this case. I highly recommend that you consider using a product called Capstar which helps to kill a lot of fleas at once and it can be given every day to effect. I would not give up on the Seresto just yet as it may be failed because of heavy flea exposure and it would otherwise work well. However, if this occurs again especially under regular circumstances then that would be the time to consider other flea preventative products such as Bravecto or Frontline day plus for example. The most effective way of cleaning the house is by vacuuming all the surfaces that have contact with Riley on a daily basis until no fleas are seen. You can now use a comb to remove any fleas or flea dirt. This is very likely going to help. I hope you find this information helpful. Good luck and have a great day!

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    Answered By David Elbeze, DVM, MRCVS

    Veterinarian

    Published on

    If you have found 4 fleas, i guaranty you he has many more. here is the list of the best flea products on the market. Spot ons: Revoulution Advantage Advantage Multi Frontline (ticks as well) Tablets: Trifexis/comfortis Bravecto (ticks as well) - for dogs House spary: Indoorex

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