I have two cats at my dad’s. We always use Advantage wich is perfectly safe. But this time we noticed the cats had flea’s and ran to the store to get medication. But this time we got the dreaded Hartz flea drops. After a week and 2 times of applying it we still saw fleas everywhere. So we realized that the Hartz medication obviously doesn’t work at all. So today we went up to the Petco and went to get the usual Advantage. But we also wanted to get flea bombs. They have a vet in the store that’s not associated with Petco and asked about what kind of flea bombs to get and about why Hartz doesn’t work. The vet said that the medication gets into the bloodstream and has harmed and killed many cats. When we heard this we were furious! We had no idea. So then she says that the signs of it are the cats might shake or act sensitive or scared. Well are cats did this for about three days scattered throughout the week. So we went back to the house– flea sprayed and bombed it and took the cats to a petcare center down the street and said they could get rid of the fleas and checked our cats and said luckily we stopped using the Hartz in time but many people haven’t been so lucky. So this is what I’m doing to help out. I’m gonna post and hand out signs everywhere —- giving facts about Hartz—- what it does to animals—– why we should stop this product from being produced—- and the adress of this website.