We're actually having problems with both now. I had originally posted about problems with Frontline (which is now wholly ineffective for me). But, we've tried advantage recently and had really bad results.

Our dog is on Comfortis, which seems to be working. We're still working on what we can put on our kitty (he's on chemo, and we're being very cautious...). Regular baths might work, but they would stress him way too much. For now, we're doing lots of combing.