We adopted Cody when he was about 18 months old from the Humane Society. It took him about 6 months to start interacting with us. He was very aloof and would bolt for the door every chance he could. Now he's very friendly.
He loves people and is really patient with our 11 month-old grandbaby. I'm not sure why his owners surrendered him as someone obviously took time to teach him some basic commands.