Im forced to say that the mentioned simulareties between sledge dogs and our dogs is as far aprts as a wide legger and a gamecok!!. pleas let me tell you guys that sledge dogs work on a MUTCH slower metabolisem and use way less quik energy sourses then our dogs do.
And sledge dogs work with there mouths OPEN being able to consume vast amounds of COLD DENSE AIR!!! where a APBT works with his mouth CLOSED!!!! in mutch hotter bad air inviroments and used mutch faster dilverd energy sourses. there is a significant diferens in the engine departmend here!!. as it al comes douwn to a diferend AIR FUEL BANG.