Chows can be nasty.
I had a chow lab mix. Good guard dog. Especially around kids. If kids came over to play with my kids that dog wouldn’t let their parents, if he didn’t know them, near any kids.
Yup... It would be pretty rare for a German Shepard to turn on its owner. But A chow can snap like a pit bull. Not as persistent and deadly as a pit bull though. If this had been a pit bull then the lady would be in the morgue right now.