Hey guys, OP here. Posted this before I made a username. I didn't actually place her on my shoulder, I was sitting on the couch letting her run around next to me and she decided to climb up my chest and onto my shoulder. Suddenly I heard this weird crunching sound next to my head and I picked her up and saw the clump of hair hanging out of her mouth! Then it was like playing tug-of-war with a dog. She would NOT let go. I didn't think I'd have to pull as hard as I did just to pull something out of a guinea pig's mouth lol! I didn't want her getting sick so I put her back in her cage and threw the hair in the garbage.