K9 Advantix II Medium Dog 11–20 lbs Flea & Tick Treatment – 6 Month Supply

K9 Advantix II Medium Dog 11–20 lbs Flea & Tick Treatment – 6 Month Supply

$71.19
$71.19 $79.99
SAVE 11% Sold out

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K9 Advantix II Medium Dog 11–20 lbs Flea & Tick Treatment – 6 Month Supply

K9 Advantix II Medium Dog 11–20 lbs Flea & Tick Treatment – 6 Month Supply

$71.19
$71.19 $79.99
SAVE 11% Sold out

Give your dog complete, vet-trusted protection with K9 Advantix II for Medium Dogs — the powerful, fast-acting formula that defends against fleas, ticks, and mosquitoes before they bite. Specially designed for dogs weighing 11–20 lbs, this topical treatment delivers 6 months of continuous, waterproof protection to keep your pet safe, comfortable, and itch-free.

Unlike oral medications that require a bite to take effect, K9 Advantix II kills and repels pests on contact, stopping fleas, ticks, and mosquitoes before they can harm your dog. It starts working within 12 hours, killing fleas at all life stages — eggs, larvae, and adults — to end infestations and prevent new ones.

Perfect for dogs that love the outdoors, its waterproof formula remains effective after baths, swimming, and rain. One easy monthly dose gives your dog lasting relief and you peace of mind.

🌟 Key Benefits

✅ Triple Defense Protection – Kills and repels fleas, ticks, and mosquitoes on contact.

✅ Fast-Acting & Long-Lasting – Starts working within 12 hours; protects for up to 30 days.

✅ Vet-Recommended – Trusted protection for medium-sized dogs.

✅ Breaks the Flea Life Cycle – Eliminates eggs, larvae, and adults.

✅ 6-Month Supply – Easy monthly applications for continuous coverage.

✅ Waterproof Formula – Remains effective after bathing or swimming.

✅ For Dogs 11–20 lbs – Gentle yet effective for medium breeds.

🧬 How It Works

K9 Advantix II combines Imidacloprid, Permethrin, and Pyriproxyfen for a triple-action defense that kills and repels fleas, ticks, mosquitoes, biting flies, and lice — all without waiting for a bite. The treatment spreads naturally across your dog’s skin and coat, forming an invisible shield of protection.

📦 What’s Included

6 × Monthly Doses (6-Month Supply)

Easy Application Instructions

💚 Why Pet Owners Choose It

No pills. No mess. No waiting for bites. Just one easy, once-a-month application for fast relief and long-lasting defense. With K9 Advantix II, your dog stays safe from harmful pests year-round — even during outdoor adventures.

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Advanced Flea, Tick & Lice Protection You Can Trust

Keep your cats and dogs protected with a proven formula designed to eliminate fleas, ticks, flea eggs, flea larvae, and chewing lice. Trusted by pet owners for fast-acting, reliable monthly protection.

Trusted Protection. Everyday Comfort.

Keep your pets protected from fleas and ticks with a long-lasting solution that's simple to use, veterinarian recommended, and designed for everyday comfort.

Month-Long Protection in Just One Application

Keep your dog protected from fleas, ticks, mosquitoes, and biting flies with a fast-acting formula that delivers reliable protection for up to 30 days.

Compare Our Trusted Flea & Tick Protection Brands

Find the right flea and tick protection by comparing the key benefits of our most trusted pet care brands.

Features Frontline Plus Advantage II K9 Advantix II Seresto
Kills adult fleas
Kills flea eggs
Kills flea larvae
Protects against ticks
Repels mosquitoes
Repels biting flies
Kills chewing lice
Waterproof protection
Monthly topical treatment
Up to 8 months protection
Easy to apply
Suitable for cats
Suitable for dogs

    Frontline Plus

    Frontline Plus helps protect cats from fleas, flea eggs, flea larvae, chewing lice, and ticks. It also helps break the flea life cycle by preventing future infestations.
    Apply one dose every 30 days for continuous flea and tick protection. Regular monthly treatment provides the best results.
    Yes. Frontline Plus for Cats is suitable for kittens 8 weeks of age and older that meet the minimum weight requirements listed on the package.

    Seresto

    Seresto provides continuous flea and tick protection for up to 8 months without the need for monthly applications.
    Yes. Seresto remains effective after occasional exposure to water, including rain and bathing, although excessive water exposure may shorten its effectiveness.
    Yes. The collar is designed for continuous wear and should remain on your pet to maintain uninterrupted protection.

    Advantage II

    Advantage II kills adult fleas, flea larvae, and flea eggs to help stop flea infestations quickly and effectively.
    Advantage II begins killing fleas within hours after application and continues protecting your cat for up to one month.
    Yes. Indoor cats can also be exposed to fleas, making monthly flea prevention an important part of their health care.

    K9 Advantix II

    K9 Advantix II helps protect dogs against fleas, ticks, mosquitoes, biting flies, and lice.
    No. K9 Advantix II is formulated only for dogs and should never be used on cats.
    Apply one treatment every month to maintain continuous protection against fleas, ticks, mosquitoes, and other listed pests.