We have a male (sly) and girl (sasha) whom are about 2 years old. Sly woke up with a bald spot on his neck we took both of them to the vet and he found flea poop but no fleas on them. He gave us frontline plus (I think thats the name) and we put it on them on Friday. They are still scratching like crazy and it is now Tues. How long does it take to kick in? We also washed all our sofa coverings and bedding and vacuumed the whole house, we have all hard wood floors too. I have read about cutting up a flea collar and sticking the pieces in the vacuum, can I do this is I have a bagless vacuum? Also what else can I do to my house to get rid of the fleas? I plan on trying to wash them tonight, but that probably wont work with Sasha. I will also try the salt on the rug trick too for our area rugs. We check and we cannot find any fleas on them. Any ideas?