IT CAN CAUSE COLIC IN GUINNIE PIGS FEED THEM CELERY ,BEETROOTS ,PEAS ,GREEN GRASS OR A FEW LEAVES I HAVE 3GUINNIE PIGS AND IM USE TO RAISING THEM ALSO THEY LOVE TO SQUEEL ALOT THERE HAPPY AND THERE COMMUNICATING WITH U in there own way and make sure they get a vitiam suppaply in there water ....they also love slices of oranges,apples