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Two dogs sitting in a forest surrounded by mountains with K9 Advantix<sup>®</sup> II logo overlaid at the top.

Kills and repels through contact — no biting required.

Every dog is up for the next outdoor adventure, and nothing should hold them back. K9 Advantix® II kills fleas, ticks and mosquitoes through contact, meaning they don’t have to bite your dog to die.


  • K9 Advantix® II spot-on treatment is easy to apply—it only takes a few seconds.
  • Our formula is waterproof after 24 hours and provides 30 days of protection, so your dog is free to explore the world.

K9 Advantix® II is vet-recommended, so you can repel the bugs and propel the day.

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Protection from fleas, ticks and mosquitoes with K9 Advantix® II.

K9 Advantix® II kills and repels bugs through contact, so when your dog is exploring the outdoors, the bugs don’t have to bite to die.

K9 Advantix® II kills and repels fleas FLEAS
K9 Advantix® II kills and repels ticks TICKS
K9 Advantix® II kills and repels mosquitoes MOSQUITOES
K9 Advantix® II kills chewing lice CHEWING LICE
K9 Advantix® II repels biting flies BITING FLIES

SEE PRODUCT DETAILS
Product Label Application & Safety Information
K9 Advantix<sup>®</sup> II for extra large dog packaging
  • Compare K9 Advantix® II to Frontline as well as other brands.
Chart showing the benefits of K9 Advantix<sup>®</sup> II vs. Bravecto vs. Frontline Plus vs. NexGard vs. PetArmor. No other brands kill and repel mosquitoes, ticks and fleas.

  • Based on label claims.

    K9 Advantix is a registered trademark of Bayer. Frontline and NexGard are registered trademarks of Boehringer Ingelheim Animal Health. Bravecto is a registered trademark of Intervet, Inc. dba Merck Animal Health. PetArmor is a registered trademark of Velcera, Inc.

Border collie lying in field of grass.

The more you know, the better. For both you and your dog.

  • Fleas, ticks and mosquitoes can cause diseases that may compromise your dog’s health. Learn about parasite prevention below.

    Mosquito Diseases in DogsKnow the Facts >

    Flea Diseases in Dogs Know the Risks >

    Tick Diseases in Dogs: It May Only Take One BiteLearn More >


Flea, tick and mosquito treatment for your dog
— the smart way.

  • Why are flea, tick and mosquito bites dangerous for your dog?

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    Bites can cause more than just discomfort. 0:40

  • How long does it take for K9 Advantix® II to work?

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    Kill fleas, ticks and mosquitoes through contact— no biting required. 0:38

K9 Advantix<sup>®</sup> II lab puppy next to product packaging for small, medium, large and extra-large dog products.

Let’s make outside the largest dog park on Earth.

K9 Advantix is a registered trademark of Bayer.