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K9 Advantix II for Dogs 55+ lbs Flea Tick & Mosquito Treatment – 6 Monthly Doses

K9 Advantix II for Dogs 55+ lbs Flea Tick & Mosquito Treatment – 6 Monthly Doses

Regular price $54.20
Regular price Sale price $54.20
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Shipping & Returns

Free USA Shipping on Orders Over $120

We ship all US domestic orders within 1-3 business days

Returns & Refunds Policy

30-Day Return Policy

We offer a 30-day return policy from the date of delivery.

To qualify for a return:


  • The item must be unused

  • The item must be in original packaging

  • Proof of purchase is required

Non-Returnable Items

The following items cannot be returned:


  • Opened pet food or treats

  • Personalized products

  • Clearance or final sale items

  • Hygiene-related pet products

Damaged or Incorrect Items

If you receive a damaged or incorrect product:


  1. Contact us within 72 hours of delivery

  2. Provide photos of the product and packaging

  3. We will arrange a replacement or full refund

Return Shipping


  • If the return is due to our error (damaged or incorrect item), we cover return shipping

  • If the return is due to customer preference, the customer pays return shipping

Refund Processing

Once we receive and inspect the returned item:


  • Refunds will be issued to the original payment method

  • Processing time: 5–10 business days
View full product details

Keep your large dog protected with K9 Advantix II for Dogs Over 55 lbs. This powerful monthly treatment helps kill and repel fleas, ticks, mosquitoes, biting flies, and lice before they become a problem.

The fast-acting waterproof formula works through contact, meaning fleas and ticks do not need to bite your dog to die. With 6 easy-to-apply doses, your dog gets long-lasting protection and comfort for up to 6 months.

Key Benefits

  • Specially made for dogs over 55 lbs
  • Kills fleas, ticks, and lice fast
  • Repels mosquitoes and biting flies
  • Helps prevent flea infestations
  • Waterproof after 24 hours
  • Easy monthly topical application
  • 6 doses for extended protection

Why Choose K9 Advantix II?

K9 Advantix II provides trusted broad-spectrum protection for active dogs that spend time outdoors. Its advanced formula helps keep your dog comfortable, protected, and pest-free all year round.

How to Apply

Apply one full tube directly to your dog’s skin between the shoulder blades every 30 days for continuous protection.

FAQs

1-How long does K9 Advantix II last?

Each dose provides up to 30 days of protection against fleas, ticks, and mosquitoes.

2-Is K9 Advantix II waterproof?

Yes, the treatment becomes waterproof after 24 hours of application.

3-Can fleas die without biting my dog?

Yes, K9 Advantix II kills fleas through contact, so they do not need to bite your dog first.

4-How often should I apply K9 Advantix II?

Apply one dose every 30 days for continuous protection.

5-Is this suitable for all dogs?

This version is specifically made for dogs weighing over 55 lbs.

  • 5 stars: 20 (91%)
  • 4 stars: 2 (9%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
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Jason

The six-dose package is what initially caught my attention because I prefer buying several months of pet supplies at once. Each treatment is clearly separated, making the monthly routine simple.

R
Rachel

My dog spends a lot of time outside, so having a monthly treatment for fleas, ticks, and mosquitoes is important to me. I found the application process fairly easy and liked that each dose is individually packaged.

D
Derek

I bought this because I wanted one monthly treatment that covered more than just fleas. The packaging is clear, and the six separate doses are easy to store and organize. Applying it to my dog was quick once I got used to parting the fur properly.

M
Melissa

This treatment has been convenient for keeping my 70-pound dog protected during our regular walks and backyard time. The applicator is simple to use, although I had to make sure I followed the directions carefully the first time.

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Nathan

I’ve been using K9 Advantix II for my large dog for a few months now, and the application is very straightforward. The individual doses make it easy to keep track of monthly treatments. I also like that it covers fleas, ticks, and mosquitoes in one product, which is convenient during outdoor season.

B
Bailey

After trying several options, I settled on this one because it fits my routine well. The six dose pack offers good value over time and my dog has tolerated every application without issues.

E
Eric

This has become my regular flea prevention choice because it's straightforward and dependable. I haven't experienced any leaking applicators and each dose has been easy to use.

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Nicole Simmons

I was looking for a solution that covered both fleas and ticks and this checked those boxes. The treatment was easy to apply and my dog didn't seem bothered afterward.

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Jonathan

My experience has been fairly positive overall. The product appears to do its job, although I continue to inspect my dog after visiting wooded areas.

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Turner

I appreciate that this treatment is simple enough for first-time users. The instructions were easy to follow and the application took less than two minutes

D
Daniel Phillips

The product seems well made and the monthly doses are individually packaged, which helps avoid confusion. My only minor complaint is that I have to distract my dog for a few minutes while the treatment dries.

O
Olivia

I've used K9 Advantix II for one full season now and the results have been encouraging. My dog seems comfortable after every application and flea problems have been minimal.

R
Rachel Morgan

The packaging is compact and each dose is clearly labeled, making it simple to stay on schedule. My dog hasn't experienced any skin irritation and I appreciate the straightforward directions.

P
Peterson

My Boxer spends hours in the backyard every day, and this treatment has helped reduce flea issues noticeably. I like that it also covers mosquitoes which is an added benefit in our area.

B
Brian

I've tried a few different flea treatments over the years and this one ranks among the easiest to apply. The instructions are clear and the packaging keeps each dose organized.

E
Evans

I bought this based on recommendations from friends. So far, it has met my expectations by keeping fleas under control.

B
Bennett

This product has been effective for my 60 pound mixed breed. The application process is simple and I appreciate that there isn't a strong lingering odor.

H
Hughes

My Golden Retriever spends a lot of time outdoors, so flea and tick prevention is essential. Since switching to K9 Advantix II I've noticed a significant reduction in pests.

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Emily Foster

Overall, I'm satisfied with this product. It was easy to apply between my dog's shoulder blades and the formula dried fairly quickly.

D
David Ramirez

I like that each box includes six monthly doses, so I don't have to remember to reorder often. The packaging is straightforward and the instructions are clear.

J
Jennifer Collins

This treatment has worked well for my German Shepherd during our weekend hikes. I noticed fewer ticks compared to previous years and applying it only takes a minute.

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Michael Anderson

I've been using K9 Advantix II for my 70 pound Labrador for several months and it's been reliable throughout flea season. The applicator is easy to use and I appreciate that it covers fleas, ticks and mosquitoes in one treatment.