---
product_id: 291601197
title: "FRONTLINE Shield Flea & Tick Treatment for Medium Dogs 21-40 lbs. Count of 3 | Kills fleas, ticks & chewing lice, repels mosquitoes, waterproof 24 hr, monthly application"
brand: "frontline"
price: "R$894"
currency: BRL
in_stock: true
category: "Frontline"
url: https://www.desertcart.com.br/products/291601197-frontline-shield-flea-and-tick-treatment-for-medium-dogs-21
store_origin: BR
region: Brazil
---

# fastest working Frontline formula effective for medium dogs 21-40 lbs 30-day waterproof protection FRONTLINE Shield Flea & Tick Treatment for Medium Dogs 21-40 lbs. Count of 3 | Kills fleas, ticks & chewing lice, repels mosquitoes, waterproof 24 hr, monthly application

**Brand:** frontline
**Price:** R$894
**Availability:** ✅ In Stock

## Summary

> 🛡️ Stay steps ahead of pests—because your dog deserves the ultimate shield!

## Quick Answers

- **What is this?** FRONTLINE Shield Flea & Tick Treatment for Medium Dogs 21-40 lbs. Count of 3 | Kills fleas, ticks & chewing lice, repels mosquitoes, waterproof 24 hr, monthly application by frontline
- **How much does it cost?** R$894 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/291601197-frontline-shield-flea-and-tick-treatment-for-medium-dogs-21)

## Best For

- frontline enthusiasts

## Why This Product

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

## Key Features

- • **Puppy & Adult Safe:** Gentle yet powerful treatment suitable for puppies as young as 9 weeks and dogs up to 40 lbs.
- • **All-Stage Pest Defense:** Kills and repels fleas, ticks, larvae, and chewing lice to stop infestations before they start.
- • **Lyme & Heartworm Defense:** Repels ticks that carry Lyme disease and mosquitoes linked to heartworm.
- • **Rapid Full-Body Coverage:** Fast-acting formula spreads quickly via sebaceous glands for continuous protection.
- • **Long-Lasting Waterproof Shield:** Protects your dog for a full 30 days—even through baths and rainy walks.

## Overview

FRONTLINE Shield Flea & Tick Treatment delivers fast, proven, and waterproof protection for medium dogs (21-40 lbs) with a powerful 3-in-1 formula that kills and repels fleas, ticks (including Lyme disease carriers), chewing lice, and mosquito pests for a full 30 days. Safe for puppies 9 weeks and older, it continuously replenishes through sebaceous glands, ensuring your dog stays protected rain or shine.

## Description

FRONTLINE Shield for Dogs, from the number 1 name in flea and tick protection (1), is the fastest working FRONTLINE product. It is proven flea and tick protection with repellency action against ticks and mosquitoes. FRONTLINE Shield repels ticks that may transmit Lyme disease and mosquitos that may lead to heartworm disease. The long-lasting, 3-in-1 flea and tick topical formula protects your dog for a full 30 days. It is an effective flea and tick treatment for pups big and small, effective for puppies as young as 9 weeks and weighing at least 5 pounds. After application, the treatment rapidly covers your dog's entire body and deposits in the sebaceous glands. These glands act as a reservoir, continuously replenishing the treatment onto your dog, working even if your dog gets wet (2). Apply monthly to ensure your dog is protected all year long. So, no matter your plans, FRONTLINE Shield protects from fleas and ticks —inside your house, outside on walks and hikes, and everywhere in-between. Protect your dog with FRONTLINE Shield so you can go anywhere together. Subscribe and save today to make it easier to keep your dogs or cats protected year-round and make sure you never run out of FRONTLINE Shield. Be sure to visit our brand store and follow us to stay up to date on new FRONTLINE products, features, tips and more. References: (1) BI Marketing Excellence Survey performed by Kynetec, November 2023. (2) Waterproof 24 hours after application.

## Features

- FRONTLINE Shield provides proven flea and tick protection with repellency action against ticks and mosquitoes
- Kills and repels all stages of ticks, including those that may transmit Lyme disease
- Kills chewing lice and adult fleas, flea eggs and larvae to prevent re-infestations
- Convenient to use, easy to apply, waterproof formula protects for a full 30 days
- For dogs big and small; effective for puppies as young as 9 weeks and weighing at least 5 pounds

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08P3CYX3H |
| ASIN  | B08P3CYX3H |
| Active Ingredients | Fipronil, Permethrin, Pyriproxyfen |
| Age Range Description | All Life Stages |
| Allergen Information | Octopus Free |
| Best Sellers Rank | #11,195 in Pet Supplies ( See Top 100 in Pet Supplies ) #48 in Dog Flea Drops |
| Brand Name | Frontline |
| Customer Reviews | 4.3 4.3 out of 5 stars (597) |
| Date First Available  | November 23, 2020 |
| Dog Breed Size | Medium |
| Included Components | Treatment |
| Item Form | Stick |
| Item Type Name | Topical |
| Item Weight | 0.03 Kilograms |
| Item model number  | 849 |
| Manufacturer | Boehringer Ingelheim Animal Health |
| Manufacturer  | Boehringer Ingelheim Animal Health |
| Manufacturer Part Number | 849 |
| Manufacturer recommended age  | 1 month and up |
| Model Number | 849 |
| Product Dimensions  | 0.74 x 5.8 x 4.39 inches; 1.13 ounces |
| Scent Name | Unscented |
| Target Species | Dog |
| UPC | 350604064930 |
| Unit Count | 1.00 Count |
| Volume | 6 Milliliters |
| Warranty Description | Contact the manufacturer. |

## Product Details

- **Active Ingredients:** Fipronil, Permethrin, Pyriproxyfen
- **Age Range (Description):** All Life Stages
- **Allergen Information:** Octopus Free
- **Brand:** Frontline
- **Dog Breed Size:** Medium
- **Item Form:** Stick
- **Item Volume:** 6 Milliliters
- **Item Weight:** 0.03 Kilograms
- **Scent:** Unscented
- **Unit Count:** 1.00 Count

## Images

![FRONTLINE Shield Flea & Tick Treatment for Medium Dogs 21-40 lbs. Count of 3 | Kills fleas, ticks & chewing lice, repels mosquitoes, waterproof 24 hr, monthly application - Image 1](https://m.media-amazon.com/images/I/71A0Hl8zuvL.jpg)

## Available Options

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

## Questions & Answers

**Q: Both of my dog's weights hover around 20 lbs, sometimes a bit over.  Should I choose the small or medium size product?**
A: The box will include the weight recommendation. I think 20 is medium but check the box to make sure.

## Frequently Bought Together

- Frontline Shield Flea & Tick Treatment for Medium Dogs 21-40 lbs. Count of 3
- Frontline Shield Flea & Tick Treatment for Large Dogs 41-80 lbs. Count of 3
- FRONTLINE Shield Flea & Tick Treatment for Small Dogs 11-20 lbs., Count of 3

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-07-28*