I also want to add this, because domestication is a big interest of mine due to my work with mustangs:
I've mentioned before that I'm a professional horse trainer, and I have to make some comparisons here...there is still a variety of truly wild horse, Przewalski's Horse, in existence in Asia. Przewalski's horse resembles the domesticated horse, but handling them is totally different. They can be tamed, but their demeanor is totally different.
Zebras are the same. The zebra strongly resembles the horse (minus the distinctive stripes), and the herd behavior is largely the same. But zebras are wild.
People do tame them and I even know of a person who competes with a zebra (unsuccessfully) in endurance rides, but I've also trained and trimmed (I'm a farrier and worked with a local zoo) zebras and they're awful from a domestication standpoint. It's a constant battle--you have to always be on your toes, managing the situation, rewarding the zebra for positive behavior and never giving them a chance to challenge you because they weigh like 700+ pounds and their hooves really hurt.
On the other hand, I've trained several BLM mustangs (US wild horses for international readers) captured from the wild. These horses are more accurately described as feral, because they are the descendants of domesticated horses that escaped from Spanish conquistadors, European-descended American ranchers, and native peoples (and keep in mind that the Native horses were also descended from European horses, since Europeans reintroduced the horse to the Americas, but Native peoples bred their horses for distinctive traits). But mustangs are relatively easily brought back into true domestication if you know what you're doing. It's very different from a truly wild equine such as a zebra or Przewalski's Horse.
So yeah...I may not have both wolf and dog experience, but based on my experience with domesticated vs. truly wild (not feral) equines, I couldn't accept pack theory even without the more scholarly refutations that have come out.