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K9 Advantix K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free

K9 Advantix

K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free

K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free is a vet-recommended flea, tick, and mosquito treatment for large dogs. Priced at $73.15, it offers 8 doses total and provides month-long protection per application. Ideal for pet owners seeking reliable, long-term pest defense without frequent reapplication.

$73.15

● In stock

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Price and availability may change. Click to see current details on BestVetCare.

Key features

  • 8 doses total (6 paid + 2 free)
  • Monthly protection for large dogs over 55 lbs
  • Kills fleas, ticks, mosquitoes, and lice
  • Fast-acting: kills fleas within 12 hours
  • Water-resistant after 24 hours
  • Topical application between shoulder blades
  • Vet-recommended brand for parasite control

Pros

  • +Long-lasting 30-day protection
  • +Effective against multiple pests
  • +Includes 2 free doses for savings
  • +Fast kill time for fleas
  • +Water-resistant and easy to apply
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Cons

  • Not safe for cats or small dogs
  • Contains permethrin, toxic to cats
  • Topical residue may transfer temporarily

About K9 Advantix K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free

What is K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free?

K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free is a topical parasiticide designed for dogs weighing over 55 lbs. Each dose delivers a full month of protection against fleas, ticks, biting lice, and mosquitoes. This 6-dose pack includes 2 free applications, totaling 8 months of coverage. Formulated with active ingredients imidacloprid and permethrin, it works by repelling and killing pests on contact, reducing the risk of disease transmission like Lyme disease and heartworm. Applied monthly to the skin between the shoulder blades, it’s waterproof and fast-acting, starting to kill fleas within 12 hours.

Key features

  • Extended Protection — Each dose lasts up to 30 days, reducing application frequency.
  • 8 Doses Total — Get 6 paid + 2 free for added value and long-term use.
  • Broad-Spectrum Defense — Targets fleas, ticks, mosquitoes, and biting lice.
  • Vet-Recommended Formula — Trusted brand used by veterinarians for large dogs.
  • Water-Resistant — Remains effective after swimming or bathing.
  • Fast-Acting — Kills fleas within 12 hours of application.
  • Easy Topical Application — Single monthly dose applied directly to the skin.

Who is K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free for?

This product is designed specifically for dog owners with large breeds weighing over 55 lbs. It’s ideal for pets that spend time outdoors, especially in wooded or grassy areas where ticks and mosquitoes are common. Not suitable for cats or dogs under 55 lbs. Best for owners seeking a proven, monthly topical solution that prevents infestations and reduces disease risk from biting pests.

How does K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free compare?

Compared to oral flea and tick chews, K9 Advantix offers longer-lasting, contact-based protection that repels pests rather than waiting for them to bite. Unlike generic topical treatments, it includes permethrin, which enhances tick and mosquito defense. It outperforms standard polypropylene collars in efficacy and speed. However, it’s not safe for households with cats, unlike some oral alternatives. The 6+2 dose pack offers better value than buying standard 6-packs separately.

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Best use cases

  • Monthly flea and tick prevention
  • Mosquito protection in warm climates
  • Outdoor dogs in tick-prone areas
  • Seasonal pest control (spring to fall)
  • Veterinarian-recommended maintenance
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Is K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free right for you?

This product is best for owners of large dogs over 55 lbs seeking reliable, monthly pest protection. No special skills needed—just apply topically once a month. Consider oral chews if you have cats or prefer non-topical options. Compare with generic topicals or collars for cost and convenience. Always verify weight-based dosing to ensure safety and effectiveness.

How it compares: K9 Advantix offers stronger tick and mosquito defense than most oral chews and standard collars. It repels pests on contact, unlike ingestible treatments that require biting. However, it’s not cat-safe, limiting use in multi-pet homes. The 6+2 dose pack provides better value than standard 6-packs.

Are There Active BestVetCare Coupons for This Product?

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Summer Must-haves for Pets €“ 20% OFF Heartworm Prevention + Free Shipping*

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Frequently Asked Questions

What does K9 Advantix protect against?

K9 Advantix protects dogs over 55 lbs from fleas, ticks, mosquitoes, and biting lice. It kills fleas within 12 hours and repels ticks and mosquitoes on contact, helping prevent diseases like Lyme and heartworm.

Does K9 Advantix work on cats?

No, K9 Advantix is not safe for cats. It contains permethrin, which is toxic to felines. Keep treated dogs away from cats until the application site is dry, typically 24 hours.

How often should I apply K9 Advantix?

Apply one dose monthly for continuous protection. Reapply every 30 days, especially during peak flea and tick seasons, to maintain effectiveness and prevent infestations.

Is K9 Advantix waterproof?

Yes, K9 Advantix is water-resistant after 24 hours. It remains effective after swimming or bathing, but avoid shampooing too frequently to maintain optimal protection.

Can I use K9 Advantix on small dogs?

No, this blue-labeled version is for dogs over 55 lbs. Using it on smaller dogs can cause adverse reactions. Choose the correct size based on your dog’s weight for safety.

How much does K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free cost?

K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free is $73.15 at BestVetCare. Prices may change — click through to BestVetCare for the latest.

Is K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free in stock at BestVetCare?

Yes, K9 Advantix Extra Large Dogs Over 55 Lbs (Blue) 6 Doses + 2 Free is currently in stock at BestVetCare.

Are there coupon codes for BestVetCare?

Yes — Love Those Deals currently tracks 4 active BestVetCare coupons. See the coupons section on this page to copy a code before checkout.

Specifications

Brand
K9 Advantix
Product Type
Animals & Pet Supplies > Pet Supplies > Pet Flea & Tick Control
Category
Animals & Pet Supplies > Pet Supplies > Pet Flea & Tick Control
SKU
3913
GTIN
643996929148
MPN
Bayer-K9-Advantix-557
Last updated Apr 28, 2026