A wild rabbit will smell A LOT different to a domestic one. Because the domestic rabbit isn't showing any of the body language it would in the wild, this doesn't stimulate the dog much. Besides, dogs only really go into hunting mode when they're in familiar places where they've seen rabbits before (from my experience), the dog will see it as a member of the pack (household) or it'll just be pretty f*cking confused. haha.
Nice dog by the way.