[header] How to stop barbering in guinea pigs [title] Look for causes of barbering. [step] Identifying the cause of barbering can help you figure out how to stop it. Stress, boredom, or competition for resources can all lead to barbering. 
Make sure all your pigs have their own hiding places, food bowls, and water sources. This can help alleviate stress and competition for resources, and could stop the barbering behavior.