I was wondering if a guinea pig nipping another guinea pig is normal? I recently bought two guinea pigs at Petsmart. I noticed that since the day we took them home one of them nips the other one a lot. They are both female. The one that nips is bigger and seems more dominant. Is there anything we can do to stop the nipping. Is it a personality issue? When we let them exercise outside of the cage, they chase after each other in a fun way and sometimes seem to get along fine. The one getting nipped makes very loud wheeks when it happens so I'm worried that she's getting hurt. Thank you.