However- after reading this repeatedly- I do have a few comments. First of all welcome new puppy..
Second- it will take a good 9 months before the puppy is " up and running" so you still only have 7 dogs until then. Is there any possiblity the other dog Yukon could have been trained the wrong way for him? Meaning- some dogs are late bloomers- and maybe he needs more time- going back to square one. We have a lady in our county that does this sled pulling. She puts the harness on the dogs for days so they get use to it, and associate with food etc.. I am not going to sit here and pretend I know how to train a sled dog- I am just trying to make the point maybe he needed to be trained a different way to make it on the team. He is already old enough. Maybe he just needs more training- or needs to run with a different dog- one he likes more etc until he gets the point of this. I am hoping you will look at how he was trained, and think of another way you could work with him on this- meanwhile- the puppy grows up...