Hey how are you? just a few words, we have a hamster. Little contact needed with the kids and still able to teach responsibilities for animals. They say cats and dogs, keep out of sleeping area and so forth, toooo much work for us. A ferret, is like a rat/cat, and very dirty. Like washing hands at every contact and avoid any area contacted by the ferret. I think that is for CFers and or regular kids, so choice is yours I suppose. I trust only my daughters pediatrician, so I would ask him and only his input would be valid, for me. But on the other hand, I would love to get my son a cat cause he loves them but my daughter has CF and that over powers his love for cats. I think he will have like 10 when he is grown and on his own. lol
take care ps hope this helps