The only big difference between the two is simple, most of your wild hogs in the U.S. are simpley that just plain ole wild hogs, domestic stock that got loose years ago and breed like cockroaches.

European hogs, generally the males have shorter back legs and a more pronouced hair line on there backbone area. Another thing I have noticed which sets the different bloodlines apart is the european sows have larger eye teeth than domesticated stock...

As for there over-all attitude I have never found a mean hog , just get really mean when you have them cornerd or they scent you in the dark....