Yupp.

Not common, just possible. OP's story is incredible, not impossible.

Teyrnon is wrong because they claimed that there are no documented attacks of a healthy wolf attacking a person in northern America. In fact, there have been three lethal and 24 non-lethal documented attacks by healthy wolfs since 2000 in north America.

Dude, the article I linked literally mentions solitary wolves walking more than 500 km in search of a mate. Sure they "usually" move in packs, but that is what makes this story unusual, not impossible.

"Massive" is relative. To a child a 30 kg dog is massive.

If you mean 3 out of 4 facts: "Individual weights can vary from 32 kilograms (71 lb) to 60 kilograms (130 lb)." Which is well within the range of a large dog.

"A wolf that has left its pack may travel up to 500 km (310.7 mi) to breed." https://en.wikipedia.org/wiki/Interior_Alaskan_wolf

What?

You are wrong. Candice Berner, Kenton Carnegie and Marc Leblond were all deemed to have been killed by healthy wolves.

There have been at least 24 non-fatal wolf attacks by healthy wolves since 2000 in north America alone: https://en.wikipedia.org/wiki/List_of_wolf_attacks_in_North_America

Alaskan Tundra wolves (wander down into Yukon sometimes) are white. https://en.wikipedia.org/wiki/Alaskan_tundra_wolf

Even the Interior Alaskan(native to Yukon) wolf ranges in color from black and White. https://en.wikipedia.org/wiki/Interior_Alaskan_wolf