Anyone who knows anything about mountain lions knows this is utter crap.
Note, this was a state guy who made this comment...not a Fed guy. When you typically talk about a fish and game guy...he usually got there with some kind of degree in biology or earth sciences....which means very little in terms of animal behavior. I remember the state fish and game guy in my home county in Alabama in the mid-1970s...who spent 30 hours of his forty weekly hours...just fishing in the state-provided boat on the lake.
There is a chance that the dog did start it, without seeing evidence you can’t say what happened.