Bio Spot Spot On Flea and Tick Control for Dogs Review

I was asked by a freebies site to try Bio Spot for free in a 3 month trial. The ad claimed it was safe and easy to use and the name bio implies natural medicine. The first month I used it my dog seemed fine and he didn't have any fleas but the second month I applied it according to the directions and almost immediatly my dog began rolling on the floor crying and trying to rub it off. I bathed him right away but it didn't seem to help very much. His eyes began to itch and he started rubbing his face on the floor to stop the itching. I called my vet and he told me to give benedryll and that it should help but might take a couple of days. My poor baby had to take benedryll for 3 days before there was any relief at all. I typed Bio spot into a search engine and found that this is not an unusual reaction to the product and some poor animals were not as lucky as my  dog. The negative reviews I read seemed to apply  to smaller breeds and I have a mini dox. I am thinking  that as expensive as his front line was Its time to go back to it I can't put a price on his health and comfort