Last week I applied HARTZ flea and tick drops between my cats shoulder blades. The next day I noticed his skin was red and his hair was falling out. I never use this stuff and now feel really bad. It was too late to try to wash it off so i used a cool wet wash cloth to sooth his skin. I have been using triple antibiotic ointment 2 times a day and he’s not getting any better. Now he has no fur where I used the HARTZ and his skin is so irritated and red. I can’t believe this stuff is still on the shelves in stores all over the world. I think the maker and employees of HARTZ should all be rubbed down with their products and see how they like it!