Up to 7 days a week
Guinea pigs can eat Swiss chard as a part of their staple vegetable portion, as it is a delicious addition to their diet and provides essential nutrients. However, it should be fed in moderation to prevent diarrhea and potential bladder stone formation due to its oxalic acid content. It’s important to note that most of the oxalate found in urine is produced by the body, rather than absorbed from food, so it can still be included in their diet in small quantities.