Peter,

your dog looks so much like mine, except Sieg had green eyes, whiter socks on the two front legs and less white on the chest and little on the belly. He probably was a bit heavier in the chest though weighing close to 70 lbs - 31 kgs. Perhaps he was older? The face is almost identical.

Like the photo of Sako in the snow.

I'm guessing GSP's get fairly cold in snowy conditions like that or do they toughen up?