I wrote to the Northeast ferret list about this, but I'll write the same basic stuff here. I've missed part of the discussion, but if anyone having flea problems lives in this part of the country, you probably have the same fleas as me: they seem to prefer ferrets and people. I've treated my animals over and over, even had the vet do my cats so they were done properly, but he said there's no sign of fleas on either of my cats. However, my ferrets are covered, one is losing fur he's had fleas so badly. And the Advantage and Frontline just don't seem to be cutting it, at least not on their own. Orkin Pest Control told me fleas can feed off of dead fleas, so you need to vacuum EVERY day, make sure there's a flea collar in your vacuum bag or lock up the vacuum bag in plastic and throw it way way out of your house. Vacuuming also picks up the eggs, but nothing really kills the pupae stage of the flea, so you may see more fleas in a couple weeks when they emerge from the pupae stage (which even Advantage and sprays can't penetrate). So you really have to treat bedding, carpets, furniture, etc. every couple weeks. The fleas will still bite your pet--the Advantage and Frontline work AFTER the flea has bitten. And like I said, I have found plenty on me and my daughter, but none on my cat. so here in the Northeast at least, we have a more difficult flea! debbi [Posted in FML issue 3544]