I started my boston terrier on Frontline for fleas two months ago. By the second dosage, I am still seeing a few fleas on him. My roomate has a kitten and she is not on Frontline or anything for fleas. My dog goes outside, but her cat stays inside. Ive seen a few on her once in a while. Is he getting them from her, or is he bringing them in from outside and if he is, does it take time for the fleas to bite and get the Frontline into their systems and die? Im really annoyed because I payed all this money to prevent this from happening. I really feel like calling and complaining about this to Frontline and demand my money back. What should I do?