This was about 8 years ago, however my cat ginger was about a year old, I have her a flea bath and she starting foaming at the mouth. I freaked out, and washed everything I could off of her right away. Thankfully after I did that and wrapped her in a blanket I called the vet and they told me it was a allergic reaction. I disagreed and since then have used anything Hartz related. I did use it on her brother and he was fine.