Comment by AngryData

I had a dog when I was younger that was from a dog sled line but was many generations removed from pulling sleds. She seemed to love to pull on stuff, ropes, leashes, toys, people holding her, or whatever else, so we bought a dog harness and attached a garden wagon to her a few years in. And she was absolutely obsessed with pulling it around and seemed like she would have happily run herself to death pulling it around if we let her. The harder you tried to hold the wagon, the harder she would pull and the more fun she seemed to be having.

It is just anecdotal, but I 100% believe there was nothing she found more entertaining and fun than to pull that wagon because of her genetics. There was no training involved, within seconds of hooking her up with a harness she just knew what she had to do.