I live near Ottawa, so I know what you're talking about, Boxxy and I go for walks everyday in the winter, he seems ok to me, once we walked for nearly half an hour in about -20 c and he got a cramp in his hind leg, I just rubbed it out, he was fine after that, I try to take him out at least fro 20 minutes everyday, of course in the summer it's much longer than that, like hours, I don't make him wear a coat or anything like that, he'll shiver once I bring him in, doesn't seem to bother him that much, and as far as snow, he loves it, the deeper the better, he'll go in the yard and run and jump in it, of course he doesn't do this for long, but if he could stay out longer he would