badmother--I noticed the title of the thumbnail pic you attached was "dogbike." I found the thread with the picture (at the bottom of page) that explains the title:
http://www.bikeforums.net/showthread...hlight=dogbike
That's a great shot! Have you been able to do as much with the detachable as with the original "dogbike"? I'd consider building up an xtracycle as a catbike, but they wouldn't stand for it.