i would like to tell you about my experience with useing hartz advanced tick and flea drops. i have a terrier mix dog,she’s always been healthy,and never seems to get sick,until i used these drops on my dog,she was sick for several days,wouldn’t eat,and could bearly get around the house. i was thinking these companies would never sell anything bad for your pet,so i was hopeing my dogs problem was from something else. i was dead wrong,and made a horrible mistake by putting on my terrier a 2nd time months later. she got so sick this time i knew for sure it was the hartz product. i washed her over and over and over,she was still terriblet sick for several days. shame on hartz,for knownly selling dangerious products.