Just 3 or 4 days ago my boyfriend and i bought Hartz Advanced care 4 in 1 flea and tick drops+ for his 3 dogs. Two of the dogs were acting fine, but one refused to leave the garage and just lied on the floor with his legs sprawled out. We thought he just didnt want to go back outside so we picked him up and put him out with the other two dogs. A couple days later we found him in the very back corner of the yard dead. Did the Hartz drops kill him? I wish i would have researched it before i used it. We’ve always used Hartz on our dogs and have never had a problem until now. I decided to research his mysterious death and found this site. This absolutely breaks my heart. Had i not used this medication he might still be alive. he was only 3.