Yep - stress poops. New foods, new environment, new people, etc. Are you feeding the same food as the breeder gave him? I would hold off on any more new treats for a couple of weeks, let him finish settling in first so you don't upset his stomach too much.
~*~*~ Kelsey ~*~*~
RIP my sweet Lily ~ 6/12/08 - 1/20/12