Hi all, I rescued a kitten last friday (7/2). We suspect he has been on the street for approximately 2 weeks. On the Sunday (9/2) I noticed a flea crawling through his fur. With it being a sunday, I only had access to Amazon Prime so I purchased Frontline Spot On for Cats and applied the same day. I hoovered the house and all the furniture also. I have been trying to check his fur but as I'm sure you can appreciate, this can be tricky as he often thinks I'm trying to play. Then today (15/2), I noticed another flea crawling through his fur. I checked the packet on the treatment and it specifies not to treat your cat more frequently than every four weeks. Can anyone suggest what to do?!! Thanks in advance.