---
product_id: 9550903
title: "K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply"
brand: "k9 advantix"
price: "3355672₫"
currency: VND
in_stock: null
reviews_count: 12
category: "K9 Advantix"
url: https://www.desertcart.vn/products/9550903-k9-advantix-ii-medium-dog-vet-recommended-flea-tick-mosquito
store_origin: VN
region: Vietnam
---

# For dogs 11-20 lbs Waterproof after 24 hours Kills fleas in 12 hours K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply

**Brand:** k9 advantix
**Price:** 3355672₫
**Availability:** ❌ Out of Stock

## Summary

> 🐾 Protect your pup, repel the pests, and never miss a playdate!

## Quick Answers

- **What is this?** K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply by k9 advantix
- **How much does it cost?** 3355672₫ with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/9550903-k9-advantix-ii-medium-dog-vet-recommended-flea-tick-mosquito)

## 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

- • **Effortless Application:** Fragrance-free, topical spot-on treatment applied in seconds—no pills or collars needed
- • **No Prescription Hassle:** Available OTC so your dog stays protected without extra vet visits
- • **Rapid Flea Elimination:** Kills fleas within 12 hours to stop infestations fast
- • **All-in-One Pest Defense:** Vet-recommended formula repels & kills fleas, ticks, mosquitoes, biting flies, and lice
- • **Long-Lasting Protection:** Waterproof after 24 hours for durable, month-long pest defense

## Overview

K9 Advantix II Medium Dog is a vet-recommended, fast-acting topical treatment designed for dogs weighing 11-20 lbs. It kills fleas within 12 hours and repels ticks, mosquitoes, biting flies, and lice. Waterproof after 24 hours, this fragrance-free formula offers convenient monthly protection without the need for a prescription, ensuring your dog stays pest-free and ready for adventure.

## Description

K9 Advantix II Medium Dog is the veterinarian-recommended formula that helps defend your dog against five pests: fleas, ticks, mosquitoes, biting flies and lice. And unlike other treatments, K9 Advantix II kills and repels fleas, ticks and mosquitoes. K9 Advantix II topical treatment gets straight to work killing fleas on dogs within 12 hours of initial application. This formula stops existing flea infestations and prevents new ones by killing adult fleas on contact so they can’t lay eggs and they don’t have to bite your dog to die. Fleas, ticks, mosquitoes and other pests not only cause discomfort; they may also transmit disease. Monthly use of K9 Advantix II is important to protect your dog against fleas that may cause transmission of tapeworms. This formula also kills fleas which may cause Flea Allergy Dermatitis and flea bite anemia. That’s why K9 Advantix II Medium Dog topical, spot-on formula makes application simple - going on in seconds. It's easier than a flea collar and there are no hard-to-swallow pills. You’ll also love that K9 Advantix II is fragrance-free and waterproof after 24 hours of application. Check the product label for information on application and potential side effects. K9 Advantix II pest protection is effective on both indoor and outdoor dogs. Your dog should be at least 7 weeks old and weigh 11-20 lbs. to use K9 Advantix II Medium Dog. For the ultimate convenience in care, K9 Advantix II is available over the counter – no prescription needed. And, you can stock up with 2-dose, 4-dose and 6-dose packs so you never miss a monthly treatment. Once K9 Advantix II is applied, your dog is ready to get right back to big-pup cuddles and racing around the park. K9 Advantix II Medium Dog is a trademark of Elanco or its affiliates.

Review: Bye-Bye Bugs, Hello Happy Pup 🐾🛡️ - K9 Advantix II keeps fleas, ticks, and mosquitoes far away from my small dogs. Easy to apply, vet-recommended, and works fast — no more itchy, grumpy pups. Peace of mind for me, tail wags for them. Highly recommend if you want a pest-free pooch.
Review: After half a year of fleas, switching to this product completely got rid of them! - Cannot recommend enough! I live in the middle of the mountains next to a large national forest. There's deer, beer, turkey and all sorts of wildlife moving through my yard and in the woods year round, visibly agitated by fleas. My dog of 14 years finally got fleas (she's an inside dog with lots of outdoor playtime), as I've been thorough with checking her fur during brushings and baths. I usually just give her monthly flea baths which sufficed, but after a neighbor clear cut their property I've had an influx of wildlife on my property and I think that contributed to my dog getting fleas, I'm not sure. Regardless, she had fleas and they became an irritating presence within my home. Unfortunately, there's plenty of carpet for them to hide in and lay eggs. Yuck! I tried everything to get rid of them! Carpet powders, flea baths (different brands), furniture spray, cheap flea drops.. nothing worked. I battled with them for almost 6 months!! My poor dog was waking up constantly scratching and pacing back and forth throughout the house. I felt like an awful parent and was going crazy before finally deciding to look into the more expensive options.. Now, considering how much I spent on cheaper alternatives that didn't work or get rid of the problem at the source, I really wish I would've went straight for the higher priced option first. Within a matter of weeks of using this product I saw a quick decline in fleas inside the house and on my dog. Within one to two months, they were completely gone! I was in complete shock. I cannot praise this product enough. Maybe it's so effective on the fleas in my area since I live in the rural countryside where they're not used to it, as opposed to city fleas, so your mileage may vary. But for me this was a miracle product and I will be using this as a preventive measure in the summer months, with a periodic dose in the winter. If you struggled with fleas for months and months like I have, you will know the complete relief that comes with a flea-free home. Don't skimp! It may be more expensive than the alternatives but trust me with I say I tried all of them and nothing came close to getting rid of them, whereas this treatment was so fast and effective I was left nearly crying when I saw my sweet dog sleeping soundly through the night. :)

## Features

- K9 Advantix II Medium Dog 30-day treatment & prevention protects dogs 11-20 lbs. from fleas, ticks, mosquitoes, biting flies and lice
- Kills fleas within 12 hours of application
- Vet-recommended formula kills & repels on contact so fleas don’t have to bite your dog to die
- Easy-to-apply topical treatment is fragrance-free and waterproof after 24 hours
- No prescription needed

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004QMX4RY |
| ASIN  | B004QMX4RY |
| Age Range Description | 7 weeks and older |
| Best Sellers Rank | #991 in Pet Supplies ( See Top 100 in Pet Supplies ) #6 in Dog Flea Drops |
| Brand Name | K9 Advantix |
| Breed Recommendation | Medium |
| Color | Medium Dog only |
| Country of Origin | Germany |
| Customer Reviews | 4.4 4.4 out of 5 stars (33,348) |
| Date First Available | October 5, 2004 |
| Date First Available  | October 5, 2004 |
| Department | Pet Supplies |
| Department  | Pet Supplies |
| Directions | Application Instructions: 1. Use only on dogs. DO NOT USE ON CATS or other animals. 2. The dog should be standing for easy application. Evenly apply the entire contents of the K9 Advantix® II tube to two or three spots on the top of the back from the shoulder to the base of the tail. 3. At each spot, part the hair until the skin is visible. 4. Place the tip of the tube on the skin and gently squee… |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 7.75 x 1 x 4.25 inches |
| Item Package Dimensions L x W x H | 4.76 x 4.37 x 1.42 inches |
| Item Weight | 0.05 Pounds |
| Item model number | 86315157 |
| Item model number  | 86315157 |
| Manufacturer | Elanco US Inc |
| Manufacturer  | Elanco US Inc |
| Model Name | K9 Advantix II |
| Number of Items | 4 |
| Product Dimensions  | 7.75 x 1 x 4.25 inches; 0.8 ounces |
| Size | 4 Pack |
| Specific Uses for Product | Parasites |
| Style | Medium Dog Only |
| Target Audience Keyword | dogs |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Age Range (Description):** 7 weeks and older
- **Allergen Information:** Allergen-Free
- **Brand:** K9 Advantix
- **Dog Breed Size:** Medium
- **Item Form:** Topical
- **Item Volume:** 4 Milliliters
- **Item Weight:** 0.05 Pounds
- **Scent:** Unscented
- **UPC:** 085400000522 724089584984 724089203724 891962001521 024089584985 724089351326

## Images

![K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply - Image 1](https://m.media-amazon.com/images/I/719Apa6wL0L.jpg)
![K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply - Image 2](https://m.media-amazon.com/images/I/71SCebDcfqL.jpg)
![K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply - Image 3](https://m.media-amazon.com/images/I/71a-ElIlHLL.jpg)
![K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply - Image 4](https://m.media-amazon.com/images/I/81EDjQqM2WL.jpg)
![K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 4-Mo Supply - Image 5](https://m.media-amazon.com/images/I/81M-SZuOsGL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Bye-Bye Bugs, Hello Happy Pup 🐾🛡️
*by S***P on December 24, 2025*

K9 Advantix II keeps fleas, ticks, and mosquitoes far away from my small dogs. Easy to apply, vet-recommended, and works fast — no more itchy, grumpy pups. Peace of mind for me, tail wags for them. Highly recommend if you want a pest-free pooch.

### ⭐⭐⭐⭐⭐ After half a year of fleas, switching to this product completely got rid of them!
*by V***T on September 16, 2025*

Cannot recommend enough! I live in the middle of the mountains next to a large national forest. There's deer, beer, turkey and all sorts of wildlife moving through my yard and in the woods year round, visibly agitated by fleas. My dog of 14 years finally got fleas (she's an inside dog with lots of outdoor playtime), as I've been thorough with checking her fur during brushings and baths. I usually just give her monthly flea baths which sufficed, but after a neighbor clear cut their property I've had an influx of wildlife on my property and I think that contributed to my dog getting fleas, I'm not sure. Regardless, she had fleas and they became an irritating presence within my home. Unfortunately, there's plenty of carpet for them to hide in and lay eggs. Yuck! I tried everything to get rid of them! Carpet powders, flea baths (different brands), furniture spray, cheap flea drops.. nothing worked. I battled with them for almost 6 months!! My poor dog was waking up constantly scratching and pacing back and forth throughout the house. I felt like an awful parent and was going crazy before finally deciding to look into the more expensive options.. Now, considering how much I spent on cheaper alternatives that didn't work or get rid of the problem at the source, I really wish I would've went straight for the higher priced option first. Within a matter of weeks of using this product I saw a quick decline in fleas inside the house and on my dog. Within one to two months, they were completely gone! I was in complete shock. I cannot praise this product enough. Maybe it's so effective on the fleas in my area since I live in the rural countryside where they're not used to it, as opposed to city fleas, so your mileage may vary. But for me this was a miracle product and I will be using this as a preventive measure in the summer months, with a periodic dose in the winter. If you struggled with fleas for months and months like I have, you will know the complete relief that comes with a flea-free home. Don't skimp! It may be more expensive than the alternatives but trust me with I say I tried all of them and nothing came close to getting rid of them, whereas this treatment was so fast and effective I was left nearly crying when I saw my sweet dog sleeping soundly through the night. :)

### ⭐⭐⭐⭐⭐ Does not kill fleas
*by M***R on January 26, 2026*

I have used these for years and the last 3 months supply has been a disappointment they are not killing the fleas at all. My babies still have fleas crawling all over them after application. I will no loner be buying this product.

## Frequently Bought Together

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

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-02-02*