Guinea pigs require a constant intake of vitamin C – a complete well balanced diet is important to prevent serious illnesses like scurvy. You can give your pig a daily dose of vitamin C (approximately 100mg) through vitamin C tablets meant for guinea pigs.
Guinea pigs also drink a good amount of water, so be sure to provide fresh clean drinking water daily. Some vegetables can be offered to your pig. However, if diarrhea develops, stop feeding vegetables immediately. Hay is also important for pigs to constantly chew and gnaw on in order to keep their teeth short and even.