My cat Lily passed away today. She has been perfectly healthy. Tonight I went down to my basement to clean the cat boxes. I found her dead in the middle of the room. Right now I am mad at myself and I am livid with the Hartz company. I purchased flea collars for my cats. These were chosen based on the positive reviews. How can Hartz justify selling this product? I had no idea of the animals that had died from their products. After I found her and figured what happened, I got the others collars off. Lily was very petite, much smaller than the other cats. It probably won’t matter to complain to the Hartz company. They will have every excuse possible. Lily doesn’t matter to them, but she does to me. Thankfully the others seem ok.