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My dog has fleas after Sentry. Can I give Nexgard right away?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Male | unneutered | 5 lbs

Can I use sentry fiprogard plus and nexgard chewables within the same week? I applied the sentry 2 days ago and I have found fleas on my dos today. I bought nexgard chewables. How long should I wait to give nexgard to the dogs?

2 Answers

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on October 20th, 2018

The Sentry will kill the fleas on your dog, 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 (you already have done that) 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. resto (ticks as well). Unfortunately in some areas fipronil (the ingredient of Sentry) does not work against fleas and ticks anymore. However I would wait about a week to see if your dog still has live fleas on him by then (especially if you have done a lot of vacuuming) before giving him the Nexgard.

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Other Answers

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    Answered By Angel Alvarado, LVT

    Licensed Veterinary Technician

    Published on April 10th, 2020

    Yes, you can give her NexGard now. You should also treat the environment as well. This includes vacuuming everywhere and washing all bedding. Follow up with an area treatment such as Indorex or Knockout ES.

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