She looks like she had a busy day! :-)
I am curious...
did you see any difference in outlook/pulling drive/enjoyment between your GSD and those huskies (who are born & bred to it)?
( I have a shepherd/husky mix...but he doesn't seem to enjoy pulling/running...he likes to track and sniff and use his nose a lot...)
There is definitely a difference! The huskies I know personally (and others that I've met at events and trainings), both Siberian and Alaskan, do have a genetic drive for the pulling. That is their purpose, and they live for it! If you ever have a chance to attend a race, it's so cool to see those dogs light up when they see the chance that they may get to go run with their musher.
I do know quite a few other shepherds who also mush; two teams in particular I've met and seen run multiple times (with multiple shepherds).
I can only speak to my experience with Zage, because as with all dogs, they're each their own self.
Zage is higher energy, and likes to run (just for the sake of running). It took her a couple times out
and working to start to figure out what I wanted. She worked solo with me, just pulling a small weight on her tugline attached to the harness; we worked just on a collar with the bike; on foot and on wheels working on driving commands; and then she had that run on the quad with a very experienced team before we ever did harness work with a bike.
After a few times out, she understood that she was not only allowed, but supposed to pull! (going out with other dogs definitely sped up this process) Zage likes to pull, but there is a marked difference from the very drivey huskies I've seen (they do vary in pull drive).
Now that she knows what the harness and lines mean (and even my usual joring pants!), Zage also gets pumped and very ready to go, but it's expressed differently and on a different level than most huskies I've seen.
So there's my not-so-short answer!