Last night, we put Hartz’ product on both of our cats… both a larger, older Orange Tabby and a smaller one of a similar pattern but grey in coloration. This morning, the larger one was acting odd, favoring his ear as if he felt like something was running around in it. I found your site via a forum I’m a member of, and right now, I feel absolutely horrible about the fact that my actions may have killed my cat. As soon as I get home from work, my wife and I are going to bathe them both completely once more, and hope for the best. I’ll submit another entry when we learn more. Wish our kitties luck.