I have no dog in this fight (pun completely intended) as I don't hunt, feed corn or allow my dogs to run wild. But, I did hunt growing up and can assure you that domesticated dogs, even pets, will form a pack and chase deer. I remember a beautiful pair of Dobermans (think Magnum PI) chasing...
Yeah, that is a nice little cull buck. Ha ha just kidding. I have a big one around here, but never see him during deer season. I would have to break out the old 30-30 though if I did see him. Good luck this fall w/ getting a shot at him.