10 years for a dog as large as a wolf is quite a long life domesticated or not. Both size of frame and (healthy) weight play into the average expected lifespan of a dog. Marie, have you ever seen a wolf? Do you know how freakin HUGE they are? Like holy hell they are big - oh and scary. Beautiful, but very intimidating.
I didn't realise any of this until the last couple months when I have seen several wolves up north. It's funny how beautiful they are from way up in my big (commercial) truck, and how very intimidating they are when I'm on the ground with them!