---
product_id: 254553883
title: "Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 710546040004"
brand: "k9 advantix"
price: "729 kr"
currency: DKK
in_stock: true
reviews_count: 5
category: "K9 Advantix"
url: https://www.desertcart.dk/products/254553883-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-x
store_origin: DK
region: Denmark
---

# 30-day protection Waterproof formula 5-way repel & kill Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 710546040004

**Brand:** k9 advantix
**Price:** 729 kr
**Availability:** ✅ In Stock

## Summary

> 🐾 Keep your XL dog pest-free and unstoppable all season long!

## Quick Answers

- **What is this?** Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 710546040004 by k9 advantix
- **How much does it cost?** 729 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/254553883-bayer-k9-advantix-ii-flea-tick-and-mosquito-prevention-x)

## Best For

- k9 advantix enthusiasts

## Why This Product

- Trusted k9 advantix brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Long-Lasting Protection:** One application keeps your dog protected for a full 30 days—no weekly reapplications needed.
- • **Easy Topical Application:** Simple, mess-free treatment that fits seamlessly into your busy lifestyle.
- • **Waterproof & Active Fast:** Keeps working even after swimming or bathing, with flea-killing action starting within 12 hours.
- • **Comprehensive Pest Defense:** Repels and kills fleas, ticks, mosquitoes, lice, and biting flies for total peace of mind.
- • **Vet-Recommended Reliability:** Trusted by veterinarians for safe, effective pest control on dogs over 55 lbs.

## Overview

Bayer K9 Advantix II offers a powerful, vet-recommended topical solution for extra-large dogs over 55 lbs, delivering 5-way protection against fleas, ticks, mosquitoes, lice, and biting flies. Its waterproof formula starts killing pests within 12 hours and provides continuous defense for 30 days, ensuring your dog stays comfortable and protected through every adventure.

## Description

For dogs 7 weeks of age and older weighting 55 lbs and over. 5 Way Repel-and-Kill Pest Protection. K9 Advantix provides protection from more biting pests than the leading competitor.1 It not only kills ticks, fleas and mosquitoes, it also repels them! It also kills lice and repels nasty biting flies. No need to reapply after a bath or weekly swimming. Does your dog love the water? No problem! K9 Advantix is waterproof. Studies have shown your dog will still be protected after exposure to water - whether your dog has gone for a swim, has been given a bath or has been in the rain. For best results, dogs treated with K9 Advantix should be bathed with a non-detergent shampoo.

Review: No es el producto de la foto ni de la descripción. Es el Advantix normal, el de la caja azul, nada de k9 ni versión 2.. es contra 4 tipos de insectos y no contra 8 .. Lo compré por qué supuestamente era la versión ii Me siento engañado, no lo devolví por qué me iba de viaje y necesitaba echarle algo ya, si no lo habría devuelto.
Review: UPDATE I don’t know what y’all all your people take your dogs to the vets instead of showing them online here that they can’t walk. The fur is falling out of the bleeding. That’s ridiculous. Take your dog to the friggin neck. Let the vet determine the cause exactly and then if it’s in clause because of this then Put a negative and state the fact that you took him to a vet and the vet did test and it was the closet because I’ve been using this product for 25 years on my dogs back then and my new dogs now my dogs I had 16 years ago dogs I had 10 years ago dogs I had 13 years ago my 16 1/2 year old cocker spaniel has had this from the day he could actually have this And I have never had a problem with that on any of my dogs especially him you know it got rid of the fleas and I noticed a few texts very easy to get off compared when I didn’t use it like if I skipped a couple of months and they had a dick and I was like oh my God and then I would try to get it off and it was a hassle. I mean, it did not pull up. Come out whatever And so I put them back on this every month originally and if they get a tick and I see it. I just need tweezers and it just pops right off no eggs inside nothing no problem with the weather did not cause any of my dogs ever itch or lose hair so I think you people have an undergoing problem with your dog that you did not address Prior to use this. Yes, I’m gonna blame you. Yes I’m blaming all you that people that has undermining problems with their dog and you don’t take them to the vet and you add this product on top of them. Yes, it probably will do something like that. SO I REPEAT, TAKE YOUR DOG TO THE GD VETERINARIAN PROFESSIONAL LET THE PROFESSIONAL DO THEIR WORK !!!! Oh, I also have one dog right now. I have three of them English mastiff and I have one of them that sits at my back gate in the dirt never has fleas never has sticks never has any. He lays in the dirt 185 pound and his head I can look it out right now his head is in it. His whole body lengthwise is in it and I swear he digs holes just you know it makes it cool.. and there’s a picture of him laying at the fence in the dirt. He loves it. I check them every day. Nobody has fleas. Nobody has anything so you people are doing something wrong. I’m gonna blame all of you. They have a problem and I’ll say it again again again they have underlining problem TAKE THEM TO THE VET VETERINARIAN HAVE THE VET, VETERINARIAN, TECHNICIAN, AND DOCTOR EXAMINE THE DOG TAKE SKIN GRAPHS WHATEVER THE BEST HAS TO DO. DON’T BLAME THE PRODUCT UNLESS YOU DID THAT AND IF YOU DID IT AND THEN DOCTOR RUNS TEXT AND SAID YES, IT WAS CAUSED BY THAT PRODUCT. WELL HENCE THERE YOU GO AND IT’S THE PRODUCT FAULT BUT A 99.999% IT’S NOT THE PRODUCT. Started having dogs when we first got married we have we had seven English mastiffs yeah it’s addicting and they had puppies and everything so anyways I’ve been using this on my dogs from year 2000 and I use them before that on my other dog so I’ve always used it really and I love it. I mean, I swear by it this stuff is great. My dogs do not get flea or I mean I have to put a spray on them to detail the mosquitoes, but don’t see my bugs biting them. It’s pricey, but it’s worth it. You don’t wanna have your dogs get Lyme disease or you know from ticks, I really suggest this. No bother my dog knock on wood you know in the other thing is I don’t use this year around. I only use it from spring until after fall. I don’t feel I really needed in the winter time. It’s too cold outside for anything to live so I’m up Northeast And I don’t seem to have any problem and they’re not using it as soon as spring hits that’s that boom they’re on it.

## Features

- New packaging, same formula: Contains four one month applications of Bayer K9 Advantix II topical flea, tick and mosquito prevention for extra large dogs over 55 pounds
- K9 Advantix II kills through contact, so fleas, ticks and mosquitoes don't have to bite your dog to die
- Veterinarian recommended
- Repels and kills fleas, ticks and mosquitoes
- Topical treatment is easy to apply, starts working to kill fleas within 12 hours and keeps working for 30 days

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004QREOPU |
| Best Sellers Rank | #17,896 in Pet Supplies ( See Top 100 in Pet Supplies ) #26 in Dog Flea Drops |
| Brand | K9 Advantix |
| Customer Reviews | 4.5 4.5 out of 5 stars (12,375) |
| Date First Available | 2 August 2012 |
| Item Weight | 45.4 g |
| Model Number | 86315017 |
| Product Dimensions | 3.49 x 11.11 x 12.07 cm; 45.36 g |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Brand:** K9 Advantix
- **Item form:** Topical
- **Item weight:** 0.1 Pounds
- **Scent:** water

## Images

![Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for X-Large Dogs, Over 55 lbs Over 55 lb 710546040004 - Image 1](https://m.media-amazon.com/images/I/71cpzdT1OpL.jpg)

## Questions & Answers

**Q: Has anyone switched over from Frontline Plus to K9 Advantix II and is happy? For Dogs**
A: YES!!!!  I've had the same experience with my dogs as Nicole A replied.  I had been pleased with Frontline for years....but in 2012 (and ever since) it has just stopped working.  One of my dogs is a fur-making machine: and fleas don't seem to bother him...even if I am finding them on him.  The other dog has horrible flea allergies:  has immediate, sustained, and severe "hot spots" after even just ONE flea bite...skin will turn pink all over his body...and he "blows" large amounts of his beautiful, lush, scruffy coat...and he just doesn't seem to be his usual happy, bright, and enthusiastic self :-(   Using Advantix II....he seems to not have problems at all (it keeps the fleas from breeding...although if one occasional transient flea bites him....it will die...but the dog will still get a "hotspot", but nowhere as intense or sustained as without Advantix II...and if I find it quickly and clean it with vinegar, he may not even need a dose of benedryl).  During the "flea season" since using Advantix II he has been able to keep his lush coat with no problems.....to such an extent that I brought him in to my vet's office just to show the vet how well he was doing one summer (the dog had been so bad the previous summer while using Frontline that I had to take him to the vet for skin reactions, fur loss in large areas of his coat, and a secondary infection from scratching...I had been so discouraged about the flea problems that year while on Frontline that I had been taking the dog daily to the lake so he could swim and drown the damned fleas).  The vet was very pleased with the dog's condition with Advantix II, and had stated he has learned from his patients that they are also seeing less effectiveness with Frontline in recent years.  I won't use anything else but Advantix II during this up-coming flea season.  (although I do also spray his coat/skin with vinegar (mixed 1/2 with water) each day as a flea deterrent...especially if he gets a hotspot...and I add a small amount of vinegar to his food as well........and when he does need a bath:  I use EXTREMELY diluted Dr. Bronner's castile liquid soap in the "EUCALYPTUS" version....the dog tolerates it well...and it seems the scent repels fleas a bit.   I use the soap as well to launder the cover of his dog bed at least weekly).   I know that insects can get resistent to certain pesticides over time....and I suspect that is why Frontline no longer works in our area.....I sure hope it doesn't eventually happen with Advantix II as well....and I hope that producers of flea/tick products for dogs will monitor this situation and re-formulate their products as needed to address the situation--regionally if need be.

**Q: I thought I was ordering Advantage II but by mistake, ordered Advantix II.  What is the difference, and does it work the same?**
A: You can’t use advantix on cats.  sadly because advantix 2 is superior and is the best out there because unlike advantage (and unlike frontline) it repels flies and mosquitoes as well as ticks and fleas.  but it is toxic to cats.  as cats should be indoors only you shouldn’t need tick/mosquito repellent just flea.  DO NOT USE ADVANTIX ON CATS!  It is toxic to them

**Q: What about cats? I used to use Advantix on my cats with no problems, as suggested by my vet to save money. Has the formula changed?**
A: Look at the active ingredients for both the dog & cat formulas; They are exactly the same. Only difference is the dosage size which you can easily look up on the internet & save yourself a ton of money

**Q: Could I use this along with a flea/tick collar?**
A: As a vet tech we say a flea collar is basically worthless..At most may keep fleas off pets head. If you can buy flea collar at store probably won’t work and even the script only work minimal. Stick to topical like frontline plus, advantage, advantix and oral like Capstar. Flea collars are most always a waste of $. To remove fleas fast simply bathe dog and let dog sit in water…drowning fleas and follow up in few hours with topical if bad infestation. Just a flea or 2 I’d still bathe but topical probably enough. All topicals are water resistant after 24hr

## Customer Reviews

### ⭐ Review
*by R***F on 12 August 2018*

No es el producto de la foto ni de la descripción. Es el Advantix normal, el de la caja azul, nada de k9 ni versión 2.. es contra 4 tipos de insectos y no contra 8 .. Lo compré por qué supuestamente era la versión ii Me siento engañado, no lo devolví por qué me iba de viaje y necesitaba echarle algo ya, si no lo habría devuelto.

### ⭐⭐⭐⭐⭐ Review
*by A***E on 3 July 2025*

UPDATE I don’t know what y’all all your people take your dogs to the vets instead of showing them online here that they can’t walk. The fur is falling out of the bleeding. That’s ridiculous. Take your dog to the friggin neck. Let the vet determine the cause exactly and then if it’s in clause because of this then Put a negative and state the fact that you took him to a vet and the vet did test and it was the closet because I’ve been using this product for 25 years on my dogs back then and my new dogs now my dogs I had 16 years ago dogs I had 10 years ago dogs I had 13 years ago my 16 1/2 year old cocker spaniel has had this from the day he could actually have this And I have never had a problem with that on any of my dogs especially him you know it got rid of the fleas and I noticed a few texts very easy to get off compared when I didn’t use it like if I skipped a couple of months and they had a dick and I was like oh my God and then I would try to get it off and it was a hassle. I mean, it did not pull up. Come out whatever And so I put them back on this every month originally and if they get a tick and I see it. I just need tweezers and it just pops right off no eggs inside nothing no problem with the weather did not cause any of my dogs ever itch or lose hair so I think you people have an undergoing problem with your dog that you did not address Prior to use this. Yes, I’m gonna blame you. Yes I’m blaming all you that people that has undermining problems with their dog and you don’t take them to the vet and you add this product on top of them. Yes, it probably will do something like that. SO I REPEAT, TAKE YOUR DOG TO THE GD VETERINARIAN PROFESSIONAL LET THE PROFESSIONAL DO THEIR WORK !!!! Oh, I also have one dog right now. I have three of them English mastiff and I have one of them that sits at my back gate in the dirt never has fleas never has sticks never has any. He lays in the dirt 185 pound and his head I can look it out right now his head is in it. His whole body lengthwise is in it and I swear he digs holes just you know it makes it cool.. and there’s a picture of him laying at the fence in the dirt. He loves it. I check them every day. Nobody has fleas. Nobody has anything so you people are doing something wrong. I’m gonna blame all of you. They have a problem and I’ll say it again again again they have underlining problem TAKE THEM TO THE VET VETERINARIAN HAVE THE VET, VETERINARIAN, TECHNICIAN, AND DOCTOR EXAMINE THE DOG TAKE SKIN GRAPHS WHATEVER THE BEST HAS TO DO. DON’T BLAME THE PRODUCT UNLESS YOU DID THAT AND IF YOU DID IT AND THEN DOCTOR RUNS TEXT AND SAID YES, IT WAS CAUSED BY THAT PRODUCT. WELL HENCE THERE YOU GO AND IT’S THE PRODUCT FAULT BUT A 99.999% IT’S NOT THE PRODUCT. Started having dogs when we first got married we have we had seven English mastiffs yeah it’s addicting and they had puppies and everything so anyways I’ve been using this on my dogs from year 2000 and I use them before that on my other dog so I’ve always used it really and I love it. I mean, I swear by it this stuff is great. My dogs do not get flea or I mean I have to put a spray on them to detail the mosquitoes, but don’t see my bugs biting them. It’s pricey, but it’s worth it. You don’t wanna have your dogs get Lyme disease or you know from ticks, I really suggest this. No bother my dog knock on wood you know in the other thing is I don’t use this year around. I only use it from spring until after fall. I don’t feel I really needed in the winter time. It’s too cold outside for anything to live so I’m up Northeast And I don’t seem to have any problem and they’re not using it as soon as spring hits that’s that boom they’re on it.

### ⭐ Review
*by S***N on 18 June 2020*

Vino tarde y y no en la caja original si que traía instrucciones, pero además tarde

## Frequently Bought Together

- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 4-Mo Supply
- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21 - 55 lbs. | 4-Mo Supply
- K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-03-10*