hi guys, I know this subject has been covered hundreds of times but I just can't seem to figure out where I'm going wrong. I first found four live fleas on Alfie my Yorkshire Terrier approx two weeks ago, I put Frontline on him straightaway and completely blitzed my house, washed everything that was washable and sprayed flea spray everywhere. Today I have seen another live flea on him, the frontline is supposed to protect him for 8 weeks but obviously doesn't work. I haven't put frontline on Bella as I haven't seen anything on her and she's not scratching or anything and I am reluctant to do so. I don't know what else I can do, my house is really clean and I don't feel like it's infested but they are coming from somewhere, any advice would be great.