If you ever get a chance to see sled dogs in Alaska or wherever, holy shit do those dogs ever want to pull a sled. I’ve never seen an animal so fixated.
What if you never trained them to pull, and they never observed that behavior? Would they still want to do it?
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.