Jan those pictures are just way to cute!!!
Pictures of the couch is an all to familar scene at our home also

As far as greys sitting just imagine telling a muscle bound person to put his arms down, straight to there sides. They just can't there lats are just to big to allow.

When a greyhound sits there butts don't touch the floor, for the most part. So they are supporting all there weight with there legs. Kinda like if you squat half way down. Not to comfy