Seek Outside - Redcliff 6p UltraLight (Dyneema®)

Definetly look at non free standing mid/teepee style tents. We have a family of 4 with kids (4 and 10) no dog and we have an older version of big agnes gold camp 5 with inner liner. It has plenty of room for us to spread out. You might be able to make it work for you if the dog slept at people's feet and you were creative with arrangments. With the mesh inner its essentially 9'x9' square with a corner cut out for the vestibule though you don't want to be too close to the sloped walls. I'd look at something similar but slightleey bigger seek outside redcliff 6 or maybe something with a permiter bug net vs a full mesh inner.

Disclaimer: I’m not a super ultralight person, I just like to learn from this sub on places I’m willing to shed weight and ignore it or laugh at it in places where I’m not willing. I’ve packed in a 2 and 4 year old a few miles and about 1000’ elevation. If you want to get anywhere, you are probably carrying them. Meaning you get to add maybe 20-50lbs to your load depending on the size of your kid(s). You also probably don’t want to be too far in so you can get them out if the trip really goes poorly. All that to say weight may not be your biggest priority, you’re probably going to be heavy and not covering tons of ground anyway. I used a seek outside redcliff (6p tipi style tent, something like 4-5 lbs so around 1lb/occupant and my wife and I each carried about 2-2.5 lbs of the shelter) for the four of us and a dog. In hindsight, I’m really glad I did it. Kids don’t sit still so the large, standing height tent was great and still very light for what it is. The downside was that you need a big area to pitch it so you want to know you’ll be able to set it up. We were not ultralight at all. Lots of extra clothes (two year old peed/shit all the clothes we brought). The adults each have half a tent, a stove, a filter, two bags and pads, two sets of clothes, including very excessive toddler clothes, two sets of jackets…. It’s a lot of stuff to be prepared with kids. The kids packed a little water, stuffed animal to sleep with, and a little trowel to play in the dirt. It was a blast but not a long hike, not fast, not easy, and not light. Probably one of the best trips I’ve ever done.

You might find that you’ll be a bit cramped with 5 humans and a large dog in a 5p tent, would be worth looking at tipi/mid style 6p tents from Seek Outside or Argali. Both are lighter weight than the BA you were looking at, with more floor space but worse bug protection.

You can get half liners for the Redcliff now, usable separately or together, 9.5oz each. With two halves and the canopy it’ll be just shy of 6lb.

Seek outside might have something you’re interested if you’re willing to forgo a floor. I’ve got a Redcliff and am very happy with it.