You are just so wonderful for taking in a senior kiddo like this - bless your gigantic heart! It sounds like he was depressed even before you took him, so you have to wonder at how much he was really neglected before, ya know? So, this state of mind could be something that has really settled into his psyche for a bit. I think with you love and care he will eventually pull out of this and blossom. And ya know, if worse comes to worse -- there is nothing wrong w/ trying an anti-depressant for the little precious one either.