For reasons mentioned in Kay's link, I wouldn't ever use Hartz, either, but recently, in effort to save money, we let the Petsmart lady talk us into getting BioSpot for the cats and dogs. It was significantly less expensive than the Frontline Plus that we normally use. MISTAKE! I only tried it on Mimi, who did have fleas at the time because I had waited too long. It did nothing. I ended up taking it all back and got my money back and went to the vet and bought Frontline Plus for everyone. I will plan ahead when I need some more and order it online as it is much cheaper that way.

Logan