Both the Rottweiler and Doberman are aggressive, intelligent, and fierce protectors. There are umpteen physical and temperamental differences that distinguish the two. The Doberman appears athletic and more slender than the Rottie, which seems bulkier and heavier. Both are loyal and hardworking breeds, yet the Dobermans rank a little higher in loyalty than the Rotties. Pitbulls are more dangerous than the Rotties, though the latter excels more as a loyal, protective breed. However, Pitbulls are more easygoing as a companion dogs than working breeds.