Here's a thread about a couple that brought their little 15lb dog from California to Alaska on the back of their GS: http://www.advrider.com/forums/showthread.php?t=346782
Their dog Chewy is standing on the pannier and my dogbrother Comet is the one being held.
A cute photo of the 2 of 'em with Chewy's travel quarters. Good times. Mark H.