this I found after some digging. I like it, answers a lot of the usual questions after the first three. suggest watching the third movie before reading.
Well according to other sources and watching the movie a few times. The puppy adoption scene where Aleu and the lasts red puppy in the box, which is believed to be kodi. They play and when Aleu got hurt, he licks her and basically apologized. Which I think is correct due to the boy who comes up. He looks like the musher in the third movie if you look close. So yes I believe they were close.