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A man petting an Weimaraner in the yard with a red sign of Bayer K9 Advantix® II in front.

Kills and repels through contact — no biting required.

Fleas, ticks and mosquitoes want to bite your dog. These bites can cause pain, discomfort and possibly deadly disease.


  • Tick bites can transmit Lyme disease and Rocky Mountain spotted fever.
  • Flea bites can cause flea allergy dermatitis (FAD), an allergic reaction that can cause scratching, hair loss and rashes. If swallowed, an infected flea can also transmit tapeworms.
  • Mosquito bites can transmit deadly diseases like heartworm* and West Nile virus.

But let’s be honest — simply avoiding parasites isn’t possible. That’s where K9 Advantix® II for dogs comes in. K9 Advantix® II is a monthly topical treatment that protects your dog by killing and repelling fleas, ticks and mosquitoes.

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Protection from fleas, ticks and mosquitoes

Veterinarian-recommended K9 Advantix® II kills fleas, ticks, mosquitoes and lice, and repels biting flies. And because it kills through contact, pests don’t have to bite your dog 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® II for extra large dog packaging
  • K9 Advantix® II for dogs kills through contact with no biting required.
A chart showing K9 Advantix® II effectively kills and repels fleas, ticks, mosquitoes, compared to other brands.

  • Based on label claims.

    K9 Advantix are registered trademarks 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.

A Labrador taking food from owner’s hand at a park at sunset.

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 and the ways you can help your dog.

    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?

    video-thumb

    Bites can cause more than just discomfort. 0:40

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

    video-thumb

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

A veteran in uniform petting his dog in front of sign saying “K9s For Warriors”.

We're proud to partner with K9s For Warriors.

  • K9s For Warriors pairs trained therapy dogs with America’s healing heroes. We are proud to support these canines and their recovering humans.

    LEARN ABOUT K9s FOR WARRIORS

    Do not use on cats.

K9 Advantix is a registered trademark of Bayer.