From your comments, I wouldn't recommend any of the tents you mentioned...
Questions 1, 4, & 5 (stability, weather-resistance, warmth) are non-issues in this category.
Ease of set-up: I've owned a Thor, I've set up the Asgard and Squall and crawled around in them... if ease of set up is a priority, none of these qualify, IMHO. The Thor has too many poles to fiddle with (reason I sold it); the Asgard requires some weird bending with the longitudinal poles; the Squall has the strangest pole structure I've ever seen... if you set it up a few times, I'm sure you'd get the hang of it, but again, if "ease" is a priority, this isn't it.
Space: The Thor 3P would be good in space, but as noted, not sure I'd want to fiddle with set up. Maybe it'd be okay. The Asgard is actually smaller than another MSR tent, the Fury... the Fury is a little roomier, easier to set up, and a pound lighter... but still too small for another person and two dogs. The Squall would be fine in space.
Weight: Whatever. You're looking for a bomber base-camp winter tent. Some of us still use those, too...
I own a Fury (switched to that from a Thor) and love it, but it's on the small side. If I use my 25" wide pad, it's distinctly into my tentmate's side of the tent. No way I'd get two dogs in there, too. Honestly, my favorite tent for what you describe is an old Moss Little Dipper. The bad thing is the 13 pound weight; the good is everything else. Well, okay, in fairness I suppose it's not all that easy to set up. I also have a fondness for 'mids for the two people and two dogs setup... great space, great weight, easy to set up. Not so much in the way of pole structure, though.
You might check out the Sierra Designs Stretch Dome, a 3-person expedition tent, or their Alpha 3, a convertible tent; the two range from 8-10 pounds. Just for grins, check out the MSR StormKing... it's disqualified, because it's too heavy and not the simplest tent to set up (not to mention $$$), but it makes me happy to know that "bombproof" tents like that are still around (it's a disease, I know).
I don't have personal experience with them, but when looking for a tent with similar qualifications I came across the Hilleberg Nallo 3 GT as a possibility.