K9 ADVANTIX II Flea & Tick Spot Treatment for Dogs, 4-10 lbs, 6 Doses (6-mos. supply) - Chewy.com

K9 Advantix II Flea & Tick Spot Treatment for Dogs, 4-10 lbs

By K9 Advantix II
Rated 3.9271 out of 5 stars

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About This Item


  • Broad-spectrum, veterinarian-recommended treatment repels and kills fleas, ticks and mosquitoes on dogs 7 weeks or older and weighing 4-10 pounds.
  • Begins working within 12 hours and kills pests on contact.
  • Kills all life stages of fleas to prevent re-infestation; also kills lice and even repels biting flies.
  • Waterproof formula continues working for up to four weeks, even after bathing or swimming.
  • Convenient, monthly topical application contains imidacloprid, permethrin and pyriproxyfen; available in packs of 2, 4 or 6 treatments.

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Play Video: Learn More About K9 Advantix II From Our Team of Experts
Learn More About K9 Advantix II From Our Team of Experts

Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

About K9 Advantix II

Experience the Advantages of K9 Advantix II

Veterinarian-recommended K9 Advantix II kills fleas, ticks, mosquitoes and lice, and repels biting flies. Now you can help your dog fight these pesky pests through contact—no biting required. Convenient and easy to use, K9 Advantix II is for dogs and puppies 7 weeks of age or older. So help your pal get the effective protection he needs with all of the advantages of K9 Advantix II.

Why are Biting Bugs a Big Deal?

K9 Advantix II spreads over the skin and hair to kill and repel them through contact, meaning they do not have to bite to die. And if a flea, tick or mosquito is repelled, it cannot bite and transmit disease.

Why Choose K9 Advantix II?

Fleas, ticks and mosquitoes can negatively affect your pet's health. It's important to use an effective product that kills pests which can spread disease. Fleas can cause flea allergy dermatitis, an allergic reaction that can lead to constant scratching, severe itching and even hair loss. Ticks can transmit deadly diseases, such as Lyme disease and Rocky Mountain spotted fever. And mosquitoes can potentially carry dangerous diseases, too, including heartworm. K9 Advantix II should not be used in place of a heartworm disease prevention product.

Is K9 Advantix II the Right Choice for Your Dog?

Whether your dog is a winter snow hound or a summer backyard explorer, an sunseeker or an outdoor enthusiast, choose K9 Advantix II to help keep fleas, ticks and mosquitoes from interrupting his favorite activities year-round. If you want to return the love to your dog, take care of him with flea prevention that works to kill the fleas you see and the ones you don't.

K9 Advantix II Has a Treatment for Dogs Large and Small


4-10 pounds


11-20 pounds


21-55 pounds


55 pounds and over

Do not use K9 Advantix II on cats.

About K9 Advantix II

K9 Advantix II is manufactured by Bayer, a leading name in the healthcare industry for over 150 years. K9 Advantix II is a monthly flea, tick and mosquito treatment for your dog that kills through contact—no biting required. It starts working to kill fleas within 12 hours of application and is veterinarian recommended, so you can feel confident knowing that your pet is getting effective protection.
Shop Bayer

Questions & Answers

17 Customer Questions

Are there side effects from using Advantix for small dogs
Answer by TeresabApr 06, 2022
We haven’t experienced any! We hold our dog a few minutes until the drops have time to dry ( she tries to wipe it off in her dog bed)

How long do I have to wait to bathe the dog after applying?
Answer by ChewyJun 15, 2021
We suggest bathing your dog before applying K9 Advantix II. Just make sure your dog is thoroughly towel dried. K9 Advantix II is waterproof and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. If you choose to bathe your dog in between treatments, we recommend use of a general grooming shampoo for pets and waiting until the topical treatment has fully dried.

Will this product work on sticktight fleas
Answer by ChewyMay 24, 2018
This Treatment works to kill and repel all fleas present on the dog including Sticktight Fleas.

does Advantix require a prescription from the vet?
Answer by ChewyJun 29, 2018
A prescription is not needed to purchase this flea and tick treatment.

ReviewsWrite a Review

Rated 3.9271 out of 5 stars
494 Reviews
Would recommend to a friend

494 Customer Reviews

Filter by reviews that mention

Rated 1 out of 5 stars
By Ruth on Jan 7, 2023

Don't know what you mean

I have 2 chihuahuas and the flea medicine does not work on them I really hate to use a stronger medication but I need it

Rated 2 out of 5 stars
By Rango on Jan 5, 2023

Flea treatment

I have a 3 lb dog. After 5 days, he still had some fleas crawling on him. I wished it had worked faster.

Rated 1 out of 5 stars
By Mischief on Sep 24, 2022

Did Not Work

My Poms had a couple fleas on them after a romp with the neighbor dog. I applied this and as far as I can tell it did nothing substantial to kill the fleas. I recommend getting Bravecto instead. This was a waste and I will have to treat them with something else now. They are both the proper weight for this bracket.

Rated 4 out of 5 stars
By Rashell on Aug 22, 2022

My go to product

I've been using this product for about 20ish years and though quite pricey it's worked better than any of the others I've tried, plus she sits patiently while I apply as opposed to oral which I have to force down her throat, and neither of us want that. There's been a couple of times last summer that I found a few fleas on her despite using this product....which is the first time that has ever happened in all the years. I don't know if the doses in the pack I got were somehow defective or what. Otherwise does great as a preventative measure to help keep my baby safe!

Rated 1 out of 5 stars
By Leslie on Aug 20, 2022

Doesn’t work

No matter what the size or weight of your pet if the pet has any for and it’s not a very fine short hair dog this product does not work I put this on my dog and it Hass to get on the skin to be able to work. Which I did the second time I used it for sure make sure that it still did not work she got infested same with the seresto collar If product is not against skin at all times product doesn’t work but this canine Advantix just doesn’t work at all

Rated 4 out of 5 stars
By Donald on Nov 20, 2022

This seems to be working

Bought the cheaper Hartz type last time & it did not work. This brand while more expensive seems to work. No fleas or ill affects

Rated 5 out of 5 stars
By MOLLY on Nov 23, 2022


The application was easy. We will wait and see. Molly did not react in any negative way after.

Rated 1 out of 5 stars
By Samm on Oct 27, 2022

Didn't work

Didn't work well at all. Maybe a couple of days? But after that I was still seeing fleas on my dog. I do not recommend

Rated 3 out of 5 stars
By Blondie on Dec 6, 2022

Seemed to work flea wise but no other protection.

No problem with seller just the product as far as the product remain

Rated 5 out of 5 stars
By Shine on Aug 23, 2022

Fast, reliable service!

I love ordering from Chewy! The products I need are always in stock. They ship in 1 to 3 days, and for FREE. This time I got a better deal on my order than what was available in the local stores!