---
product_id: 254644750
title: "K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary)"
brand: "k9 advantix"
price: "$140"
currency: NZD
in_stock: true
reviews_count: 5
category: "K9 Advantix"
url: https://www.desertcart.nz/products/254644750-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 within 12 hours K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary)

**Brand:** k9 advantix
**Price:** $140
**Availability:** ✅ In Stock

## Summary

> 🐾 Stay ahead of pests—because your dog deserves the best defense!

## Quick Answers

- **What is this?** K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary) by k9 advantix
- **How much does it cost?** $140 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/254644750-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

- • **Waterproof Confidence:** Keeps working even after your dog’s swim or bath, waterproof after 24 hours
- • **Effortless Application:** Fragrance-free, topical spot-on treatment that’s quick and mess-free
- • **No Prescription Needed:** Convenient OTC availability means no vet visit required to protect your pup
- • **Rapid Flea Elimination:** Kills fleas within 12 hours to stop infestations fast
- • **Vet-Recommended Protection:** Trusted formula that kills & repels fleas, ticks, mosquitoes, biting flies, and lice on contact

## Overview

K9 Advantix II Large Dog is a vet-recommended, topical flea, tick, mosquito, biting fly, and lice treatment for dogs weighing 21-55 lbs. It kills fleas within 12 hours and repels pests on contact, preventing infestations without the need for a prescription. The fragrance-free formula is waterproof after 24 hours and easy to apply, providing fast, effective, and convenient monthly protection.

## 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: Very happy with the results every time. I have used this for years on my dogs and never see fleas or ticks on them! I'll never use anything else.
Review: I like this brand and the price I use to give my dog Nexgard along with the brand for heart worm It became costly so that’s why I switched It works in keeping the fleas away plus mosquitoes. No smell

## 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 | B00N7DEBN4 |
| Allergen Information | Allergen-Free |
| Batteries Included | No |
| Best Sellers Rank | #50,395 in Pet Supplies ( See Top 100 in Pet Supplies ) #54 in Dog Flea Drops |
| Breed Recommendation | Large |
| Color | Large Dog only |
| Customer Reviews | 4.4 4.4 out of 5 stars (16,006) |
| Date First Available | 20 November 2014 |
| Item Form | Topical |
| Item Weight | 40.8 g |
| Item model number | 86314940 |
| Number of Items | 1 |
| Pet Life Stage | 7 weeks and older |
| Pet Type | Dog |
| Product Dimensions | 2.54 x 11.11 x 12.07 cm; 40.82 g |
| Quantity | 1 |
| Size | 2 Pack |
| Specific Uses | Parasites |
| Storage Information | Store in a cool, dry place inaccessible to children and pets. Protect from freezing. |
| Volume | 5 Milliliters |
| batteries required | No |

## Product Details

- **Active Ingredients:** Imidacloprid, Permethrin, Pyriproxyfen
- **Brand:** K9 Advantix
- **Item form:** Topical
- **Item weight:** 41 g
- **Scent:** Unscented

## Images

![K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary) - Image 1](https://m.media-amazon.com/images/I/71TEm2OCbGL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***N on 27 January 2026*

Very happy with the results every time. I have used this for years on my dogs and never see fleas or ticks on them! I'll never use anything else.

### ⭐⭐⭐⭐⭐ Review
*by M***E on 27 January 2026*

I like this brand and the price I use to give my dog Nexgard along with the brand for heart worm It became costly so that’s why I switched It works in keeping the fleas away plus mosquitoes. No smell

### ⭐⭐⭐⭐⭐ Review
*by 2***S on 26 January 2026*

Great product. No ill effects. Easy to apply. It's not flea/tick season so effectiveness for those unknown. Dog is health and happy. Typical English Foxhound. Shipped directly with two applications. Reputable alternative to prescription systems. A good value for a reasonable price.

## Frequently Bought Together

- K9 Advantix II Large Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 21-55 lbs. | 2-Mo Supply (Packaging may vary)
- K9 Advantix II XL Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs Over 55 lbs. | 2-Mo Supply
- K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply

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