in the survivors universe people tried to "repopulate" the extremely small wolf population by releasing huskies into the wild in the hopes that they would survive long enough to be "undomesticated".
These "Wild Huskies" saw this being abandoned by their long paws for no reason and eventually were able to seek help from coyotes and a few wild dog packs and wild lone dogs. They had deals with coyotes that if they would stand guard for their pups when they hunted or slept, then they would do the same, this helped a lot since coyotes normally have smaller packs. Coyotes would tell them legends of the wolves that use to roam, and how long paws use to only occasionally hunt them as prey just as they would hunt other animals for prey along with the other animals they hunted for prey. The coyotes saw this as fair, because they recognized that you have to hunt/forage/find food if you want to survive. But then suddenly a group of long paws came, which hunted the wolves so that there was barely any left. Hearing this they eventually started calling themselves "wolves" as a way of denouncing their past history with long paws. They grew so ashamed that they eventually started telling their pups that they were never pet dogs, that they always lived in the wild. They started acting like they were better than any other canines they met, including other dogs and coyotes. However, the secret kept on coming out amongst these wild husky packs, but still they would never let those outside the packs know. They were able to place enough fear into the lone dogs and dog packs, but they couldn't make the coyotes afraid of them, which is another reason why they started shaming them so much.
Anyway, in the human point of view of things, people started to become afraid of these "Wild huskies" since a good portion of them were seemingly going out of their way to attack humans, and illegal dog fighting rings joined forces with private groups to lend out their ring fighting/blood sport dogs (which were specifically trained to never ever attack a human, only other dogs. This is unlike police dogs that were) to sort of let loose on their property as a way of trying to kill these wild huskies. They were specifically trained to kill these huskies, not deter from the property or anything.
Eventually, these fighting rings became much more well known for being trained to hunt these false wolves.
Now this next part doesn't make the most sense, but I tried my best to make it make sense, okay? So I know that there are dogs meant for hunting wolves, but seeing as those are meant to hunt actual wolves, I'm just assuming that is the reason for not using them. Then I googled dogs that are commonly used in fighting rings, and while there are a bunch of them beside Dobermans, such as pit bulls and bull terriers, but when I looked at them they didn't physically look all that different from other dog breeds, and in my opinion the ones that were most distinctive looking were the Doberman and the Dogo Argentino (also, I bull terriers would just be seen as "too small" to cause any actual harm) and so only the Doberman (and maybe also the Dogo Argentino, and we just haven't yet seen it in the series?) were given the raciest treatment of the title "Fierce dog", because of their distinctive snouts, color patterns, and ears (I think the cropped ears are distinctive personally)
Then, one day in Gracefull's pack, she had a miscarriage resulting in her enter litter's death, and went to go on a walk, and low and behold, found a leached husky pup (This was Pup/Dog/Wolf/Alpha) in a plastic bag by a stream drowning. There were other husky pups but they were already dead. The still living husky pup was clearly a newborn with his eyes not even being open yet. Gracefull was able to do dog pup CPR (I don't know how) to get the water out so the pup could start breathing again and she took it back to her Wild "wolf" pack camp, expecting the others to be thrilled that she was able to save the puppy and that they would still have another new packmate, even if obviously it would never replace Gracefull's now dead pups. Sure, they don't like dogs due to their connection with humans, but surely they wouldn't turn away a puppy that was in the same situation as their ancestors were once? Right?
Wrong, they are angry because while this huskey pup looked a bit different from them, since by now they started evolving some traits to distinguish them from any domesticated husky pets, they could still clearly see a difference. The pup would find out and while he wouldn't be able to tell everybody, he could tell enough to start rumors that wolves might not be as mythical and scary as their reputation makes them look. Eventually, Gracefull did appeal to their hearts because the pup would literally die without them, due to still being in closed eyes/nurse/newborn mode and they agreed to keep the pup on the condition that they raised him to believe that he was half wolf, and that was why he looked so similar to them.
Eventually, their hatred for the pups past still grew and grew, which was why they were the way that they were with him
