What evidence showed that buck lived a privileged life?

Buck lives in the home of Judge Miller in Santa Clara Valley. The house is large and spacious, and the grounds are beautifully laid out with orchards and gardens. For his entire life, Buck has lived here in splendor. Other dogs are present, but Buck is above them all. Buck is the king of his domain, believing himself the benign master of everyone, including his humans. He is neither a house-dog nor a kennel dog but goes where he wishes.