My two black Labs lives outside where they roam the farmsite (two chihuahuas stay inside). When I got the first Lab I renovated an old granary. I lowered the ceiling, completely insulated the room and ran power out to it and installed a milk barn heater and heated water dish and heated dog bed. The dang dog preferred to stay outside regardless if the temperature -20 or colder. He would usually sleep up on the deck. And, he continues to jump into my pond up until it freezes over.
We had German Short haired pointers as a kid in Michigan. My dad, a frustrated engineer built a dog house that was better than most people live in. Totally insulated with a lift off top. A flip door insulated, two rooms each (this was a duplex,one for sleeping with a mat and one for eating. A thermalcouple with a heat lamp that was guarded so no burns from the hot lamp. It maintained a constant 50 Degrees. And of course a fenced dog run. Our babies lived better than most people.
You give that dog (or those dogs) a great life! What a happy lab he must be.