Up to 7 days a week
Guinea pigs can eat spearmint in very small portions as an occasional treat, but it should not be a staple in their diet. While it can add variation and flavor to their meals, it is important to ensure that they consume at least 5 leafy greens as their staple vegetable portion to meet their nutritional needs. Overfeeding spearmint can potentially cause digestive issues in guinea pigs, so it should be given sparingly.