Now that's a dog's life! Amazing, he has compliance of all of those dogs off leash out in public, quite something...
I have to share this clip with my SO and build my case for another big puppy in the pack!
Since the vid is called "Free Running Sled Dogs" they must be Alaskan huskies, which isn't really a breed; mushers mix several breeds to get fast sled dogs w/stamina; each kennel has its own lines & breed combinations. They are trained to stick in a pack -- it's what they do on the trail (though they're on harness there, of course). He is keeping them in athlete's shape during the off season. Sled dogs literally train & eat like athletes because that's what they are -- sledders do not take little Fifi off the bed & force her to run a hundred miles. They're as fit as any Olympian & a heck of a lot faster -- and LOVE to run!