What happens if you download something. Does it also upload while downloading?
Is it possible to download the torrent that you seed from outside your network by yourself? Mobile network, a friend or family wifi. To be sure that it does not download it all from someone else, create a torrent from a random file, upload it to a random tracker and download the torrent from outside your network.
I think it is because a dog has been seen as an object or tool for a long time. We are the owner. We buy the one that we like the most.
With humans we don't have ownership over another human. The human is owned by itself. So we let everyone decide for themselves who the want to breed with. One person will select a partner that is nice, some like a "bad boy", some like dark hair, blond, tall short, etc.
Also, humans are really not that different from each other while dogs can look like a completely different species.