Puppy was semi-feral when I first met him. He'd follow my neighbor and me around the neighborhood on our evening walks, just like a little puppy - hence the name. But at that time, he wouldn't let anyone get close to him, although he seemed to crave attention.
After about a year, he became much more trusting; he let me pet him and pick him up. He spent some time in the house with the other two (who are purely indoor cats) - but still spent more time outside. Sadly, Puppy died of cancer in December 2011.