User blog comment:The Bonehead Skipper/Chopper's Devil fruit/@comment-1595565-20101106162837

I think we don't have enough information on the subject. We don't know the exact way a zoan fruit reacts when eaten by an animal as oppose to a human, since Chopper is the only animal so far to eat a zoan. It's hard to say at this point. The hito hito no mi itself is especially hard to figure out since there are only so many entities that can be considered human.