I just applied One Spot to my cat last night after I found a couple fleas on her. Today I noticed that the fur where I applied the drops was completely burned off and the skin was swollen, burned, and bright red. I rinsed the area with water and baby shampoo. I immediately went to the internet and found this site and I was shocked by all the horror stories related to this product. I’m going to call the Hartz 800 number tomorrow to see what they have to say. Why is this product still on the market? I am also going to contact the EPA and PETA.