this weekend I went to my local Wal-mart and bought the Hartz Advanced Care topical 4 in 1 treatment. I applied it and within 3 hours my dog could not stand up. I washed him and then he started convulsing. I contacted my local vet. He worked on him for many hours and then sent me to a larger emergency clinic in another town. Thank goodness my dog is okay now. I contacted Hartz and now have to wait 4 to 6 weeks for them to do their investigation. I am very anoyed and angry that there are even products out there on store shelves to buy that could rob us of our beloved pets. There has been so much on the news about pet food why have I heard nothing about Flea products!!!! Why is this company still in business?