Rose and Cora are primarily outdoor dogs, and now that the weather has gotten colder I'd like to build them/purchase them a dog house that will keep them comfortable this winter. The dog houses they are currently using are both over a decade old and need to be replaced regardless, I'm just trying to figure out the best way to do so. I have one of two options as far as I can see. 1.) Build this dog house: http://tidewaterkc.org/projects/insulated_dog_house.htm If I do that, I'd like to convert it to have two sleeping areas attached to the one hallway (sleeping area on each side) so the dogs can either sleep together or separate. Or, the dog houses are located that is blocked from the wind...there is a wall blocking west winds, and a double tarp blocking north winds. Is the hallway really necessary if the wind/rain/snow is being blocked by other things? If so, would it just be easier to build two square(ish) block dog houses (just the sleeping quarters) instead of one big elaborate set up with the hallway? What I'm having problems with is figuring out the sizing. Rose is about 18" at the shoulder, 65 pounds, and not very flexible. Cora is about 16" at the shoulder (roughly) and is about 30 pounds (although still growing) and she is very flexible. I don't want either one of them to be cramped, but I also don't want to give them too much space. 36"x22"x28" per sleep area was the dimension I came up with after toying around with a measuring tape, but depending on how I look at it, it almost seems like too much room. Has anyone built a similar dog house before? My uncle used a similar design for our outdoor cat house (only instead of a hallway he closed it off and used that area for a heat lamp to heat the two adjacent rooms) and it has worked very well for the kitties the past two winters. 2.) Second option would be to purchase a new igloo dog house like one of the doghouses we have currently and then just figure out a way to insulate it better for the winter. But I'm drawing a blank concerning how to do that. We never had a problem with just the igloo doghouses in the past, but the dogs also had a higher cold tolerance than they do now and I'm worried it won't be enough to keep them comfortable when the temps dip down.