why do some bulls have rings in their noses
Nose ring (animal) The nose ring assists the handler to control a dangerous animal with minimal risk of injury or disruption by exerting stress on one of the most sensitive parts of the animal, the nose. Bulls, especially, are powerful and sometimes unpredictable animals which, if uncontrolled, can kill or severely injure a human handler.[2][3]
Cat communication Touching noses, sometimes known as "sniffing noses", is a friendly, tactile greeting for cats.