Well you certainly couldn't do any events/races. But Maisy can be very reactive to strange dogs and I skijor with her.
For a dog who is highly motivated to pull/run, and with a lot of work on dryland training - stops, starts, and a good "leave it" - it is very doable. I don't use the most popular skijor trails around here or go in groups/clubs, I stay solo on lesser used parks/trails and go at very slow use times (eg weekday mornings, never weekends) and that tends to cut down on seeing other dogs. If I do see another skijorer I don't attempt to pass or be passed with her - if it comes to it, I will stop and get off the path and reel the dogs in and let someone else pass.
Even on the skis, you have a fair amount of physical control over your dog(s). It takes some practice, but at the end of the day they are attached to you and there is no reason you can't reel them in on the line OR just sit your butt down in the snow if you have to. They can only get so far away from you and they can't pull you effectively when you're dead weight in the snow.
I'd recommend getting your ski legs really under you, practice balance and using one hand to pole and the other to hang on to a line/leash, really really practice stopping on the skis (snowplowing) and turns.
