I know that as a ferret mommy I should know this, but what is ADV? My babies have been here well over a year and all are very healthy. So we are blessed. Also: how does someone REMOVE a hairball? I suppose we are blessed there also because they are given hairball treatment almost daily and it must be doing the trick. Initially it was given as a treat while the "people" got their ears cleaned and nails clipped. They beg for it. :-) Thanks for any answer! Virginia [Posted in FML issue 3972]