In short, Hamilton is great. He is very sweet and mild mannered, but can be very friendly and playful when appropriate. Living in New York, he was people-socialized about 15 min after we took him outside for the first time, since nearly everyone stops to ogle and pet him. (One Saturday when he was ~12 weeks, I took him outside to pee and a 10-15 person line developed as people waited their turn to pet him…:) We are introducing him to other puppies and dogs as much as possible, and so far he plays appropriately with them without any aggression or (much) fear.