Another poignant note that some other news sources have pointed out: it looks like she was a rescue dog. That is, in getting her, her elderly owner probably saved her from being euthanized.
Rescue dog in Stevens County returns favor, saving elderly owner who fell
There was that cat in the news a few years back who drove off that dog that was attacking and dragging a little boy in that family.
https://www.youtube.com/watch?v=EEa6jZv-Khc
https://www.youtube.com/watch?v=LSG_wBiTEE8
https://en.wikipedia.org/wiki/Tara_(cat)
If mean, if I were a cat – smaller than the dog in question, and physically less-able to take on larger animals than a dog anyway – and the dog was already doing a number on a human, that’s not a fight I’d casually jump into. And while there are a few social cat species, like lions, I don’t think that the wildcat ancestor of the housecat is a social animal, so it’s probably not really geared up to be helping out other members of a pride or anything.
kagis
Yeah, it’s solitary:
https://synapsida.blogspot.com/2020/03/small-cats-domestic-cats-closest.html
https://en.wikipedia.org/wiki/Sand_cat