Quite a lot is unknown, and likely never will be known.
The attack on the tent caught my eye.
A senior animal with malnutrition and poor dentition seems to be a common factor in some (certainly not all) attacks.
In looking for an attack on Parker Ridge, AB, I came across a separate account of a wolf in poor condition attacking through a tent wall in a nearby public campground:
“Veterinary tests have confirmed that the wolf was in poor condition and likely nearing the end of its natural life span. The wolf’s condition was likely a contributing factor for its unusual behavior, and this remains a very rare incident.”
Parks Canada also confirmed that no food or other attractants were found in or near the Rispolis’ campsite.
We don't know what goes through a bear's or wolf's brain when it sees a tent. Or makes other decisions.
, it struck me as just one of those unpredictable things: you take a well-trained dog on 99 backpacking trips in bear country without consequence. On the 100th something terrible happens.