My Blue pitbull got a bad reaction after I applied Frontline. I read on it and it is really bad stuff. I don’t know if any of you are using it on your dogs, but I recommend not using it ever. He has always been sensitive, but his coat was fine through the winter and I started applying the frontline in May and he has had two full doses and he is losing his hair and has welts on his body. I gave him an oatmeal bath and bathed him with an oatmeal Shampoo. The vet gave me a medicine for him, an anti-histimine with a steroid and he is better, will take a while to go back to normal. Just want to warn evryone that it is nasty stuff.