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Bayer K9 Advantix II Flea, Tick and Mosquito Prevention for Medium Dogs, 11 - 20 lb, 2 doses

TLDR Review: K9 Advantix II for Medium Dogs

Item: K9 Advantix II for Medium Dogs
Author: ShopSavvy

By ShopSavvy Team

Published: August 2nd, 2025

Pros

•Effectively keeps fleas, ticks, and mosquitoes off dogs.
•Lonerm users report consistent positive results.
•Reliable and superior to other products based on personal experience.
•Users describe it as an effective alternative to more expensive oral treatments.
•Works well for mosquito protection, even in tropical settings.
•Successfully keeps other pests like black biting flies away.
•Considered highly effective for tick prevention, especially in ticeavy areas.
•Comprehensive protection, also includes benefits for heartworm prevention.
•Ideal for farm settings and beneficial even in environments like Hawaii with fewer ticks.

Cons

•The high price point is a concern for some users.
•A reported skin reaction in one dog, causing twitching and itching, was noted but resolved after a bath.

Bottom Line

Bayer K9 Advantix II is a powerhouse against fleas, ticks, and mosquitoes, with many users swearing by its effectiveness over the years. Though it comes with a higher price tag, its broad-spectrum coverage, including positive user experiences in tick-heavy and tropical areas, makes it a commendable choice for pet owners serious about pest control. Just be aware of possible skin sensitivity in some dogs.

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$23.00 at Amazon