According to ADN a couple of days ago ..."Two-time champion Mitch Seavey has two compartments on his front sled runners to haul dogs, a plastic-bottom compartment behind where he stands on the sled runners, accessible by a small, swinging door and one in his front sled. He can carry four dogs between the two, he said.
"It's similar as far as hauling," he said. "But for me, it's harder for me to haul as much stuff — food and straw.""
https://www.adn.com/outdoors-adventure/ ... y-canines/