I had used this product on my dog in past infestations, and he tolerated it just fine. But now he’s getting on up there, and I was a bit hesitant at first, but other than his cataracts he seemed pretty healthy.
About 18 hours later he could barely walk — he looked like he was drunk, and he fell a few times. He soiled himself numerous times too. And he was still infested with fleas, even though the package said that many fleas would have been dead by that time.