Wow. I had no idea about the Hartz products causing so much harm. I had asked my vet about the 4 in 1 flea/tick drops for dogs under 10 lbs, but all she could tell me was she would rather me use the Advantage. After much debate, I decided to check here before applying it to my dog. I’m so glad I did. And I appreciate the work done on this site. Very informative, and I’ve made up my mind. My doggie won’t be yet another victim of this form of animal cruelty. Thank you again.