1. Meat of any kind. That means no cat, dog, or ferret food either! Guinea pig digestive systems are not set up to digest anything but plants. They don’t have the GI tract equipment to digest any meat at all, and it can make them quite seriously ill.
2. Dairy, including yogurt, cheese, kefir, sour cream, cream cheese, and cottage cheese. Again, the guinea pig GI tract is not meant for anything but plants. They simply don’t have the enzymes and other things they’d need to digest dairy products. Yogurt drops are NOT OK…they can do damage to your piggy's system, and it may take a while for any symptoms to show.