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Item #:
220363410
K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply
86% of respondents would recommend this to a friend
Item #:
220363410
XCD 207
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Bayer K9 Advantix II flea and tick prevention is a veterinarian-recommended, broad-spectrum product that starts killing fleas within 12 hours and remains effective for up to 30 days.
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What Stands Out
Broad Spectrum Protection
Effectively combats fleas, ticks, and mosquitoes, providing comprehensive protection for medium-sized dogs, ensuring a safer outdoor experience.
Vet-Recommended
Trusted by veterinarians, this treatment ensures peace of mind for dog owners seeking reliable and professional-grade protection against biting pests.
Monthly Convenience
Easy-to-use monthly application allows for hassle-free maintenance, ensuring continual protection without the need for frequent reapplications or complicated routines.
Product Details
| Brand Name | K9 Advantix |
| Unit Count | 4 Count |
| Age Range Description | 7 weeks and older |
| UPC | 085400000522 724089584984 724089203724 891962001521 024089584985 724089351326 |
| Global Trade Identification Number | 00724089203724 |
| Included Components | 4 |
| Item Type Name | Topical |
| Manufacturer | Elanco US Inc |
| Model Number | 86315157 |
| Manufacturer Part Number | 710546020004 |
| Item Form | Topical |
| Scent Name | Unscented |
| Dog Breed Size | Medium |
| Pet Type | Dog |
| Target Species | Dog |
| Item Weight | 1.28 ounces (36.29 grams) |
| Volume | 4 ml |
| Allergen Information | Allergen-Free |
| Active Ingredients | Imidacloprid, Permethrin, Pyriproxyfen |
| Product Dimensions | 7.75 x 1 x 4.25 inches (19.7 x 2.5 x 10.8 cm); 1.28 ounces (36.29 grams) |
| Brand | K9 Advantix |
| Scent | Unscented |
| Item Volume | 4 ml |
| Color | Medium Dog only |
Who Should Buy?
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Dog Owners
Ideal for pet owners seeking effective flea, tick, and mosquito prevention for medium-sized dogs weighing 11-20 lbs.
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Active Lifestyles
Perfect for active dog owners whose pets frequently engage in outdoor activities where pests are prevalent.
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Vets' Approval
Recommended by veterinarians, ensuring a trusted and clinically effective solution for flea and tick prevention.
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Small Dogs
Not suitable for dogs under 11 lbs, as the dosage may be too strong for their weight.
Product Description
K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply
About This Item
Introducing K9 Advantix II Flea and Tick Prevention for Medium Dogs, 11-20 Pounds - the ultimate solution to keep your furry friend protected and comfortable all year round. This 1-month package of Bayer K9 Advantix II is specially formulated to provide broad-spectrum coverage against fleas, ticks, and mosquitoes. Unlike many other products on the market, our veterinarian-recommended flea and tick prevention also effectively kills and repels mosquitoes, ensuring your dog is safeguarded from multiple pests with just one application. What sets K9 Advantix II apart from the rest is its unique contact-activated formula.
While some products rely on bites to take effect, our topical formula works on contact, eliminating the need for your dog to endure painful bites before the fleas, ticks, or mosquitoes are killed. This means your dog can enjoy complete comfort and protection without the discomfort of irritating bites. Within just 12 hours of application, K9 Advantix II starts working to kill fleas, providing rapid relief for your pet. And the best part? This formula is waterproof after 24 hours, ensuring continuous protection even after bath time or a swim. We understand the importance of keeping your pet happy and healthy, which is why we recommend using a grooming shampoo specifically designed for pets.
Please note that K9 Advantix II is for use on dogs only and should not be used on cats. Choose K9 Advantix II for small, medium, or large dogs and experience the gold standard in flea and tick prevention. Our top-rated product has been trusted by pet owners worldwide and is highly effective in protecting against these pesky parasites. Invest in the best flea and tick treatment for your beloved canine companion. Say goodbye to fleas, ticks, and mosquitoes, and say hello to a worry-free outdoor experience for both you and your dog.
Take control of your dog's health and happiness with K9 Advantix II today.
Have any Query? Chat with us
Customer Questions & Answers
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Question:
Can I use K9 Advantix II on cats?
Answer: No, K9 Advantix II is only meant for use on dogs and should not be used on cats. -
Question:
How long does it take for K9 Advantix II to start working?
Answer: K9 Advantix II starts killing fleas within 12 hours after application. -
Question:
Is K9 Advantix II waterproof?
Answer: Yes, K9 Advantix II is waterproof and remains effective even after exposure to water. -
Question:
Does this work on mosquitoes?
Answer: Yes! It will keep the fleas off the mosquito. But at the same time, it will kill the mosquito. Use only on dogs from 11-20 lbs. -
Question:
Can I give my dog a bath?
Answer: It's best to wait a few days before bathing your pet. It gives the medicine time to soak into the skin and do what it's designed to do best. -
Question:
How long after a bath can I put this on my dog?
Answer: Go ahead and put the drops on your dog immediately after bathing. -
Question:
Do I have to have a prescription for this product?
Answer: No -
Question:
What does the used products contain? I would like to know about the products 'like new'. How many are there?
Answer: I know this is confusing. I am selling one of the 'used' products. My product is brand new, and has the same number of doses as it says on the package. As a seller you have a form to fill out and for some reason the drop down menu on this product does not give new as an option. I am trying to get them to change this. If you have any questions about what's in the product, you can call BAYER @1-800-255-6826. -
Question:
I used it for years but last month it didn't work. Has anyone found it to be inconsistent?
Answer: Since going to a heart worm shot that is good for 6 months, we have stopped using Revolution (LOVE!) & have switched to this. The product only lasts about twenty days & then my dogs are scratching & given Benedryl until we reach the next reapplication date. This product is subpar, but I haven't found anything else to use instead. -
Question:
How do I check the lot number for K9 Advantix?
Answer: Should be on box or wrapper. -
Question:
Do I need to store this product in a refrigerator?
Answer: I would call the number on the box and ask that question. My personal opinion would be extreme cold or heat is not good.
K9 Advantix Flea Drops 86315157 Editorial Review
** K9 Advantix II Medium Dog Flea, Tick & Mosquito Treatment** K9 Advantix II has garnered a wide array of responses from users, creating a mixed but generally positive reception around its effectiveness in treating and preventing flea infestations. Several customers have lauded the product as a solution to their ongoing battles with fleas, especially in areas where flea populations are high due to the surrounding environment or increased wildlife activity. For one long-time user living near a national forest, the product proved to be a "miracle" after previously struggling for months with several other flea treatments that failed to deliver results. This individual noted a significant decline in flea activity just weeks after starting the treatment, highlighting a strong sense of relief and satisfaction that K9 Advantix II provided an effective resolution to an irritating problem. In addition to its efficacy against fleas, some reviewers also noted the product’s role in alleviating issues with ticks and mosquitoes. In one case, a customer reported that after applying the treatment, their dog was noticeably more comfortable, free from the incessant scratching that marked their existence prior to using K9 Advantix II. The product’s effectiveness appears to resonate particularly in rural locations, where users indicate that it outperforms both generics and other popular brands. However, like any product, K9 Advantix II is not without its challenges. Some users experienced adverse reactions in their pets, including skin irritations and discomfort following application. One user mentioned burns on their dog, prompting caution when adjusting dosages based on weight. Furthermore, there were customers who reported disappointing results, with claims that the product did not effectively eliminate flea populations, leading them to abandon the treatment for alternatives. Despite the mixed reviews, K9 Advantix II seems to be a preferred choice among many customers who are dealing with tough flea situations, especially after having tested other lesser-performing products. Overall, the Consensus appears to affirm its utility in managing flea infestations effectively, contingent upon careful monitoring and adherence to application guidelines. **
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Pros
- Highly effective for many users, resulting in a significant reduction in fleas.
- Provides relief from scratching and discomfort associated with flea infestations.
- Works well in rural areas with high wildlife activity.
Cons
- Some pets experience adverse skin reactions, including burns.
Platform Trust & Buyer Confidence
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Jasmin
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“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
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10 September 2026 · via Trustpilot
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“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
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Adele
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“Easy to find and order what you want on the website. Delivery is quick to the UK”
8 September 2026 · via Trustpilot
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