A quiet suburban neighborhood in northern California turned into a scene straight out of a nature documentary this week when a family’s German Shepherd faced off with a mountain lion just feet from their back porch. The chilling encounter, captured by the family’s home security camera, shows the large cat creeping into the yard under cover of darkness — likely attracted by the scent of pets or food — before being confronted by the dog, Rex, who immediately charges to defend his territory. The st