When I was a veterinary student years ago, I sometimes found a big orange cat sunning himself on my front porch at the end of my workday. He always ambled away as soon as he saw me—not a panicked dash, because he was used to humans—but he certainly was not going to let me get close enough to pet him. No one owned this cat, although my next-door neighbors sometimes fed him, and he clearly lived in the neighborhood; he and my dogs knew one another well, interacting loudly across the fence.