Several years ago I had a tuxedo cat that had a litter of the most beautiful kittens you’d ever see. It was a small litter of only 3. Kitten #1 didn’t make it through the night but kitten #2 and 3 were doing great. Summer time came and so did fleas. The easiest solution was going to the local Walmart to buy Hartz flea shampoo to wash them in. While washing the tiny faces a small amount of the shampoo got into their mouths. Not thinking anything of it I continued the bath and dried them off. They seemed to be doing ok at first then late that night they became ill. We called the number on the back of the bottle only for them to tell us to wash the kittens again and that they’d be ok. Back to the tub they went for another bath. They seemed better so we went to bed only to wake the next morning to two dead kittens cuddled together. I’m positive that the Hartz shampoo was to blame for the deaths. To this day I refuse to use anything Hartz.