It is perfectly normal when ferrets hiss. My ferrets are, for the most part, "mute" - they don't vocalize much at all... but, when Bart gets to dragging Victoria around by the neck or ear, she hisses, too. Believe it or not, it's actually a sign of affection (in this case). Victoria actually likes the attention, and as soon as Bart leaves her alone, SHE will badger him into doing it again. Ferrets hiss for many reasons, but as long as there's no fighting with blood or poop, they should be fine. :o) Gary [Posted in FML issue 4323]