Anybody who has had a chance to experience something like this (mine was with full-blown wolves, but high content wolf dogs are really not very different at all) knows it is something that really changes you. I'm glad you were able to do this :). I think everyone should!
I've got a wolf who looks that big when she rears up for a kiss... she's about 80lbs but looks like 120 with her winter coat. That big fellow actually probably is 100+ considering he's eye level when he rears up.
Not uncommon with northern breeds; Grey, arctic, russian ect ect.
If he's a hybrid it looks like there's malemute in there for size; not an uncomming pairing.