One time a about 10 years ago, Snickers alerted Linda to some kind of animal danger on the trail. (Remember Snickers was a beast dog, a mix of Doberman and German Shepherd, and super protective of Linda.) He wouldn't let her go down a smaller trail head, and started growling at the woods. She took his advice and turned around. It was probably a rabid animal. Snickers loved deer and would have gone into happy dog mode if he sensed one.