Hi folks, We have a entire half way home (11 ferrets) who live amongst 5 cats, 6 resident ferrets and 4 dogs. Of course because the felines and canines go out of doors there was a terrible flea problem there this year... so we put them on advantage -- cats, dogs , and FERRETS!!! It works wonderful-- now there are no fleas, everyone is happy and healthy. I think I would highly recommend this to owners looking for flea control in regards to ferrets-- We haven't had to use it at the shelter, but then again we don't have carpet, and no cats or dogs and bathe all new ferrets upon intake. Fondly in ferrets, Alicia a shelter MOM [Posted in FML issue 2140]