I'd agree with fuzzyone on the size. We like the 8x10 because we usually only have 2 people (and no dogs) in the tent, plus we are trying to keep it warm in some pretty cold weather. A 10x12 is 50% bigger than an 8x10 (120 sq ft vs 80 sq ft) so it gives you quite a bit more space for not much difference in price. In most climates with a decent stove, warming a 10x12 wouldn't be much of a chore.
On the rare occasion we do have a dog around, there always seems to be some singed tail hair on the stove in our 8x10.
