K9 Advantix topical flea and tick treatment for medium dogs 11–20 lb | 2-dose, kills & repels fleas, ticks, mosquitoes

K9 Advantix II Medium Dog is a monthly topical that kills and repels fleas, ticks, mosquitoes, biting flies, and lice for dogs weighing 11–20 pounds.

Designed for easy, no-prescription protection, this two-dose pack delivers a vet-recommended spot-on formula that begins eliminating fleas within 12 hours and continues to protect your dog when applied once a month. The liquid applicator spreads onto the skin in seconds, becomes water-resistant after 24 hours, and works both indoors and outdoors to reduce pest activity around your pet. Suitable for dogs at least seven weeks old, the treatment aims to interrupt pest life cycles by targeting adult fleas and preventing egg production.

How quickly will this stop fleas on my dog?

After you apply the topical to the skin, K9 Advantix II starts killing adult fleas rapidly — often within 12 hours of the first application. Because it acts on contact and repels pests, fleas don’t need to bite to be affected, which helps lower the chance of bites and their consequences.

• Begins killing adult fleas within about 12 hours.
• On-contact action reduces the need for fleas to bite to be eliminated.
• Monthly schedule helps prevent re-infestation by interrupting egg production.

Will it protect my dog from ticks and mosquitoes on walks?

The formulation both kills and repels ticks and mosquitoes, providing protection during outdoor activity. It reduces the likelihood of parasites attaching or biting, giving you more confidence when your dog explores yards, trails, and parks.

• Repels and kills multiple tick species commonly encountered outdoors.
• Helps reduce mosquito landings and bites on treated dogs.
• Water-resistant after 24 hours, so short swims or baths won’t immediately remove protection.

Is application easy and safe for household dogs?

Application is simple: part the fur and apply the solution directly to the skin in the recommended spot(s). The formula is fragrance-free and designed for monthly use; follow the label for precise dosing, safety guidelines, and age/weight limits to ensure proper use for your individual pet.

• Spot-on applicator dispenses quickly in a few seconds.
• Fragrance-free formula minimizes sensory irritation for many dogs.
• No prescription required — available over the counter for convenience.

How do I choose the right size and maintain protection?

Select the pack matched to your dog’s weight range—this product fits dogs weighing 11–20 pounds. Use one dose each month and keep extra doses on hand so you don’t miss treatments; multi-dose packs are available for continuous coverage.

• This medium-strength package is calibrated for 11–20 lb dogs.
• Apply once every 30 days for ongoing protection.
• Store unused doses per label instructions and monitor for any adverse reactions.

Who is this for: K9 Advantix II Medium is intended for dog owners seeking a monthly, veterinarian-recommended topical that both kills and repels multiple external parasites for dogs 11–20 pounds and at least seven weeks old. It’s a convenient choice for families who want quick application, water resistance, and over-the-counter availability to protect indoor and outdoor pets from fleas, ticks, mosquitoes, biting flies, and lice.

Ingredients

Imidacloprid, Permethrin, Pyriproxyfen