---
product_id: 603060365
title: "K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply"
brand: "k9 advantix"
price: "$87"
currency: NZD
in_stock: true
reviews_count: 5
category: "K9 Advantix"
url: https://www.desertcart.nz/products/603060365-k9-advantix-ii-large-dog-vet-recommended-flea-tick-mosquito
store_origin: NZ
region: New Zealand
---

# For dogs 21-55 lbs Waterproof after 24 hours Kills fleas in 12 hours K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply

**Brand:** k9 advantix
**Price:** $87
**Availability:** ✅ In Stock

## Summary

> 🐾 Protect your pup like a pro—fast, fuss-free, and fiercely effective!

## Quick Answers

- **What is this?** K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply by k9 advantix
- **How much does it cost?** $87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/603060365-k9-advantix-ii-large-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 the vet visit
- • **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 Large Dog is a vet-recommended, topical flea, tick, mosquito, biting fly, and lice treatment for dogs 21-55 lbs. It kills fleas within 12 hours and repels pests on contact, preventing bites and infestations. The fragrance-free formula is waterproof after 24 hours and easy to apply without a prescription, providing a convenient, month-long defense for your dog’s comfort and health.

## Description

K9 Advantix II Large 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 Large 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 21-55 lbs. to use K9 Advantix II Large 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 Large Dog is a trademark of Elanco or its affiliates.

Review: I thought I would need a prescription for something that works so well. My poor little dog was fine and then one day she was scratching like crazy and she made sores on herself. I thought her heart worm prevention was for fleas too.well it’s not. She had many fleas so I researched and found this product. I was thrilled that it was easily available and inexpensive! She lost a lot of hair and was miserable. I bathed her with Dr Bonner’s castille peppermint soap and applied this in the morning. She was finally able to rest and heal. I’ve already received next month’s treatment. I can definitely recommend this. Thank you!
Review: Mi perrita era bien delicada y desde q use este producto le a ido súper bien , todos las plagas desaparecieron , estoy feliz

## Features

- K9 Advantix II Large Dog 30-day treatment & prevention protects dogs 21-55 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 | B07NX5BJK8 |
| Best Sellers Rank | #52,810 in Pet Supplies ( See Top 100 in Pet Supplies ) #60 in Dog Flea Drops |
| Color | Large Dog only |
| Customer Reviews | 4.3 4.3 out of 5 stars (5,276) |
| Date First Available | 16 July 2019 |
| Item Form | Topical |
| Item Weight | 0.28 g |
| Item model number | 90204385 |
| Number of Items | 1 |
| Pet Life Stage | Adult |
| Product Dimensions | 10.8 x 2.22 x 12.07 cm; 0.28 g |
| Quantity | 1 |
| Size | 1 Pack |
| Volume | 2.5 Milliliters |
| batteries required | No |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Brand:** K9 Advantix
- **Item form:** Topical
- **Item weight:** 0.01 Ounces
- **Scent:** Unscented

## Images

![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply - Image 1](https://m.media-amazon.com/images/I/719Apa6wL0L.jpg)
![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply - Image 2](https://m.media-amazon.com/images/I/71Bs7yQ8ocL.jpg)
![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply - Image 3](https://m.media-amazon.com/images/I/71Ku9s2eqnL.jpg)
![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply - Image 4](https://m.media-amazon.com/images/I/81EDjQqM2WL.jpg)
![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply - Image 5](https://m.media-amazon.com/images/I/81H4sRSzzkL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***S on 2 February 2026*

I thought I would need a prescription for something that works so well. My poor little dog was fine and then one day she was scratching like crazy and she made sores on herself. I thought her heart worm prevention was for fleas too.well it’s not. She had many fleas so I researched and found this product. I was thrilled that it was easily available and inexpensive! She lost a lot of hair and was miserable. I bathed her with Dr Bonner’s castille peppermint soap and applied this in the morning. She was finally able to rest and heal. I’ve already received next month’s treatment. I can definitely recommend this. Thank you!

### ⭐⭐⭐⭐⭐ Review
*by V***R on 28 January 2026*

Mi perrita era bien delicada y desde q use este producto le a ido súper bien , todos las plagas desaparecieron , estoy feliz

### ⭐⭐⭐⭐⭐ Review
*by R***O on 27 January 2026*

For the price you can't beat it. My little puppy is doing great after 2 days. I will buy continuously when needed.

## Frequently Bought Together

- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 1-Mo Supply
- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 1-Mo Supply
- K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 1-Mo Supply

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-11*