The HAPPYCOW is a giant spinning hourglass-shaped brush created by German farming equipment company Kerbl that cows rub up against in order to the clean themselves. The machine takes advantage of a cow’s natural inclination to rub itself up against a tree, turning on when the animal triggers it. The brush’s manufacturers claim a slew of benefits for the device.
The brush removes dust mites and parasites by rubbing [and] improves the blood circulation to the skin. The skin is becoming more breathable and it stimulates the metabolism.