This is a great topic, Si.
As you know, we don't have any dogs anymore but we have many, many friends whose dogs go backcountry skiing with them.
Splitter had some great suggestions. I'll add a couple and maybe throw in a caution or two.
1. First off, you have to REALLY be careful about conditioning and exhaustion for the dog. They have a tendency to roam all over on the ski/boot uphill, which means they're covering much more ground than you are. If the snow is deep, they're working hard when they do that. Then when they run down as you ski/ride, they may be working REALLY hard if the snow is deep. Be mindful of that and make sure you're not working them to death. They enjoy it so much that they'll go right up to the point of exhaustion if their master isn't paying attention.
2. Along those same lines, either you or the dog should carry water and food along. They need hydration and fuel as much as we do. Eating snow to hydrate uses as much or more of their energy as it does for us. I've seen dogs start shivering and dragging in the middle of a backcountry day and I'm convinced that they're doing the doggie equivalent of hitting the wall. Some water and high-calorie snacks are important.
3. Watch their paws, especially on powder days. They can pack snow so tightly into their pads that it can split the pads and cause bleeding. Like Splitter says, you can spray Pam on them, but a lot of the dogs I've been around like the taste and immediately lick it off.

4. Be REALLY careful about them on the way down. Our local vets treat a LOT of dogs for severe ski-edge cuts every winter. The dogs love to jump and play on the descent and they'll be right next to you if they can keep up. They don't understand that those things strapped to your feet have sharp edges.
5. As Splitter says - no poop on the track

. Carry a doggie bag and use it. At the VERY least, stop and get out your shovel and bury the poop somewhere well off the track. Letting your dog poop on the skin or boot track is an UNFORGIVABLE backcountry faux pas.
Other than that, have fun.
And as for stories, here's one:
http://www.tetongravity.com/forums/s...787#post545787