I was wondering how rare it was for a dog, especially an old dog, to die on their own vs. telling us humans they are no longer comfortable and being put to sleep. The very first dog in my life was quite old when she went to the bridge, but showed no signs of pain. One day she and I took a walk around the farm, and then she went in an empty horse stall and laid down for a nap (totally normal for her) and never woke up. I've never heard of another dog dying on their own, and every senior I've owned since has needed to be PTS. Is this really rare? Or have I just only encountered it once?