Prey drive is probably from the streets. The protection sounds like herd dog stuff; I remember going to the beach with the pack in tow and having Valjean (collie/lab/who knows what cross) absolutely FREAK OUT at the other dogs' joyful leap into the surf. "You get right back on land this instant! It's DANGEROUS out there! Stop running down the beach! Stay in a little group!" He eventually wore out trying to constantly circle the rest of the dogs. :)