Like others who have shared storied on this Web site, I thought I’d try Hartz 3 in 1 flea and tick drops on my 16-lb, 12 year old cat. I had no idea this stuff was so dangerous! I have used other manufacturers’ 30-day flea treatments without any bad consequences to my cat, so I thought “Good for Hartz! They managed to produce this inexpensively and pass the savings on to customers!” Little did I know. I feel so bad. My cat was so agitated after I put it on him…running around crying, twitching, and scratching at his neck. After several spot washings, I think that I have removed much of it, but need to take him to a professional goomer for a thorough bath. I researched this product online after this episode and am outraged that Hartz will not recall this product from the shelves. Both Hartz and Petco executives are going to get an earfull from me.