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What flea and tick products are dangerous or toxic for dogs?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | neutered | 110 lbs

What flea and tick medicine has been making dogs I’ll or die

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on March 2nd, 2018

I occasionally see toxicity issues with some of the over-the-counter topical flea products like Hartz, Sergeant's, etc. - this is more commonly a problem in cats, but can sometimes be an issue with small dogs as well, especially if they've been dosed above their weight range. All of the prescription flea/tick medications currently on the market (Bravecto, Nexgard, Simparica, etc.) are quite safe and effective.

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