They are not supposed to be that massive. Unfortunatly, its one of those breeds that attracted the idiot element for awhile and the result (like labs) are oversized, agressive, dumbed down or neurotic beasties.
They are heavy dogs, but are not supposed to be huge. Siberans are the racers/endurance and thus a lot smaller and more agile. Malamutes are the freaters, to pull heavy loads.
Watch out with the sib. In temperment it doesn't fit your criteria. The best (and truest) joke I ever jeard is "the first time they fetch is your valubles for the robber". They are really smart clowns. As in to smart for their own darn good. They are notorous for being hudeini dogs and escape for funnsies and then they do what their breed for, they run. And run, and run.
Malamutes tend to be a bit dumber and more mellow, and to have som sembalence of dignity (sibes have no dignity
). Not to the point where they are boring, but more managable then the sibe. They need a stronger hand and, like I said, can be a bit aggressive if not handled well, but a good dog, with a good owner is wonderful.
We have a female, Juno, that boards. Her owners think she is a sibe. She's not. Anyway, cute as a button, playful, loves her buddie (husky cross named katie) and very cuddly when she wants. Also, clean and well behaved. Her biggest fault is nobody took the time to really teach her to walk on a lead.
both breeds tend to be happy wih other dogs, love kids (play time!) But can be death to cats.
If the size and shape confuses you, one method to tell sibes and malamutes appart is malamutes do not, should not, never, ever, have blue eyes.
I love siberians. I grew up with two. If you can take the fact that they will make a fool out of you on a regular basis, go for it. Nothing more fun then a sibe. Also nthing more exsaperating, hairraising or wildly rotten! anyone tells you diffrent, then they've never been around one.