I never trust em, particularly when I see more than one on the loose. They are descendents of dogs used in war. I had a large Doberman that took a discernable disliking to pit bull type dogs and I’ve never seen a dog smarter than my Old Doby.
I’ve never had a dog, let alone a big dog, but Dobermans are always one breed that appealed to me. Are they as intelligent as they look? Sorry, but most pit bulls look about as smart as a sack of walnuts.