Something I just thought about for you @SternRose, you will be adding adult dogs and puppies to your pack to form a sled team. You will need to evaluate the temperament of each and every dog you consider BEFORE adding them. Because some dogs can not or will not get along harmoniously together. And as your pack grows, fights can and will break out. This is especially true when adding adult dogs.
I will use myself as an example. We first found and rescued Rascal, my Belgain mix, then we purchased Dawn as a puppy. Then we added Sasha as an adult when Dawn was between 6-8 months old. Sasha and Dawn had a few scuffles, then Rascal and Sasha had a more serious fight over a bone (we did not know Sasha was gone motivated, and we now separate them during bone time). It was nothing too serious and our fault, but Sasha ended up with a ripped dewclaw from the fight. After we discovered and fixed the that problem we had no more incidents. Then we added Cheyenne as a puppy, no problems at all. Then I purchased Phantom when he was a week old, but couldn't bring him home due to age. That would have been the end of our expanding pack, but I got a call from a friend who was desperately trying to save a young female Rottwieller who was going to be euthanized. This Rottie was heartworm positive, had torn CCL ligaments in her right knee, and arthritis in her left hip, and she was only a 18 months old! I took Fiona to vets and discovered that we could treat her CCL with a knee brace to prevent surgery, because if she had surgery her other knee would blow within a year. We adopted her, brought her brace, and put her on joint supplements. (she no longer needs her knee brace

). However Fiona had never been with other dogs, and immediately our peaceful home was shattered with fights between Fiona and Dawn, and 1 horrible fight between Fiona and Rascal. Fiona also picked up my kitten in her mouth, didn't hurt the kitten but scared the holy crap out of me!. Fiona fought with Dawn the most, 2 females jockeying for the alpha female position. Rascal got involved in one of their fights, trying to defend Dawn from Fiona and that fight was horrible. Fiona and Rascal were trying to kill each other. Rascal got a puncture over his eye, right by the eye socket, Fiona got her ears ripped open and punctures in her muzzle, while breaking up the fight Fiona also bite my husband (my husband had never had dogs before and put his hands in the wrong place. I grabbed Fiona while he grabbed Rascal). Anyway, I was ready to send her back, even knowing she would be euthanized if I did so. I even contacted the shelter I got her at in preparation. But they were close for some Holiday weekend and we couldn't do anything for 4 days. We completely separated Fiona from the pack, but this couldn't last as she could not be kenneled forever. So we divided our pack into 2 groups of 3. Rascal was paired with Dawn and Phantom. Fiona went with Sasha and Cheyenne. (we split them this way for many reasons, which I won't go into). Nothing happened, even when they were all together in our prescence, no more fights broke out. We were stunned that the answer was so simple. If my husband or I are present, we have peace in the pack, but if not we separate them. Their grouping has changed, Rascal is now paired with Dawn and Cheyenne to prevent Phantom from trying to breed them before we want. And Fiona is with Phantom and Sasha. We obviously decided to keep Fiona, neither my husband or I could stomach sending her to be euthanized if we could save her life. But it is a lot of extra work, having to keep Dawn and Fiona apart.
You could very well find yourself in a similar situation once your pack starts growing. Some dogs just can not back down, for us that is miss Fiona. Fiona gets along with everyone except Dawn. And when Dawn is threatened Rascal tries to defend her, which gets ugly fast. Knowing your dogs temperaments, personality, and who they can get along with is key. Fiona, Sasha, and Rascal are fixed, Cheyenne soon will be. Phantom and Dawn will breed when the time is right. Breeding dogs usually have a higher drive to be alpha than spayed or neutered dogs, only the strongest dog mates the female. Kennels that have multiple studs always keep the studs separated when females are in heat, and the breeding pair are locked into a safepen to prevent other dogs from trying to claim the female. Please keep this in mind as well when you start building your pack. You will kick yourself in the rear if one of your babies gets injured because you didn't take precautions.