I agree that Sentry Pro Xfc Flea & Tick Killer is Horrible!! We bought it like others, because it's a good price (cheap) compared to Advantage etc. We should've just stuck w/ the expensive stuff. This Horrible Product is an absolute NIGHTMARE. As others have said in the reviews I just read, my dog started acting strange after a few hours. Scratching at things, looking & acting wrestless etc. It was just out of the ordinary so I decided to check reviews. I have Not read One good review for this product. Peoples animals have even died for goodness sakes!!! STAY AWAY FROM THIS STUFF! If there's a...