I bought this product a while back and raleys. At the time I wasn't in need of it but thought I will need some ones spring comes. I put the first dose on them about a month ago, neither had fleas or bugs on them at the time. My large dog started itching and scratching like crazy. She has some hair loss on her lower back and a small open sore . She also started to have a strange smell to her. I started to notice that she had a flea here and there so I gave her another dose 2 days ago and now she is itching and over night has 2 more sores on her body. I believe there is something way wrong with this medication. It has not prevented fleas at all. I believe cause of the sores and the rash it's attracting the bugs. I feel bad for her cause of what I put on her she is now suffering. I now have to take her to the vet to see if they can help me get her better. I wish now I would have not bought this over the counter. It's very bad for dogs. It's almost like it's burning her skin down to the flesh. This product needs to come off the shelf and not ever be sold again.