Hmmm...you are probably correct about up north. My dog is already about 60-65 lbs at 6 months of age and stands about 24-25 inches at the shoulder. He's very big I am told. He's a shepherd x maremma. Everyone that sees him says he's gonna be a monster when he's fully grown but I think he'll be just the perfect size however big he gets. He's a sweetie.
But I definitely agree that getting him to obey the commands first would be the best idea. Once the weather turns a bit warmer that'll be a lot easier since I have 2 young kids that are usually with me when we are outside.
I'm thinking Toby could do really well at pulling a toboggan next winter!! The kids will love it!