Our grews go out mooching most days and never stop working from start to finish, like other crosses some make top class lampers and ferreting dogs, it depends on how they are brought up and on the person brining them up.
Regarding brains,most of ours have been smart arses, and are as brave as lions and give 110%.
The only down side is, some can be to fast for their own good at times, and with speed comes toe trouble if there ran on the wrong terrain. My old dog Jack didn't have any problems with his feet until he was 6 yrs old, 3 injured toes that have calloused up and a snapped tendon which