Dog sled through snowy Colorado backcountry

Alaskan sled dogs are extraordinarily athletic: “When it comes down to sheer capacity for prolonged exercise,” says Ken Hinchliff, a veterinary physiologist specializing in sled dogs, “there is no other animal, including humans, that comes close to competing.”

• Half-day tours available

Alaskan sled dogs are extraordinarily athletic: “When it comes down to sheer capacity for prolonged exercise,” says Ken Hinchliff, a veterinary physiologist specializing in sled dogs, “there is no other animal, including humans, that comes close to competing.”

• Half-day tours available