Fleas are nasty because ferrets are so low to the ground they just become natural flea picker-uppers. Vacuum every other day and use flea powder the first time to suck up and kill the fleas IN the vacuum cleaner. Do NOT use flea control collars on ferrets. Remove as much carpeting from the ferret play area as possible. Fleas love to hide in carpet, furniture, etc.
Soap kills fleas.
If you must use a product to ward off fleas, Advantage or Frontline, available from vets, is effective on ferrets - use the kitten dose. If you are unsure how to work with PDF format documents, there is information in the The Pet Project Archives . That does it for this column. I d very much appreciate hearing your comments - please click on the email button at the top of this page. And don't forget to leave your email address in the body of your message.