Why Do Dogs Dig at Their Beds? The Surprising Reason Behind This Behavior. Why dogs dig at their beds before lying down. This instinct goes back to their wild ancestors, who would prepare a soft, insulated resting spot by digging into the earth. Even though our dogs now have warm, fluffy beds, this primal behavior is still hardwired into their brains. It's a comforting, familiar routine that helps them wind down and feel safe before sleep. #dog | I Love Dogs