If you are somewhere with anchor points, they make some really great lightweight hammocks with bug nets/top covers that are amazing for non-winter camping. Really great solo option, had one years ago for doing some overnighting while biking along the Bruce trail, and was about the size of a stuff k-way.
Haven't tried the ones at the link below, but can highly recommend their Mayan hammock and stand.
I picked up a Marmot Fortress 3P last year. I haven't tested this out in winter yet, but it's rated "3+" season, and got excellent reviews online for that purpose. Plenty of room for 2 humans and a sizeable dog, plus all your gear.
I was issued a Big Agnes tent for a UN Tour. Never had a reason to unpack it while I was away but I used it on every reserve ex after I was home. Lightweight, easy to set up, never used a shelter half again.