They must have hay
First and foremost, much like horses and bunny rabbits, the most important part of your cavy's diet is a healthy serving of hay. Guinea pig hay provides them with the fiber they need to maintain a healthy digestive system that keeps moving.
What do guinea pigs prefer to eat?
"The preferred basic diet for guinea pigs is unlimited amounts of Timothy or other low-calcium hay, supplemented with smaller amounts of a commercial, high-fiber, Timothy-hay based guinea pig pellets."
What do wild cavies eat?
In the wild, depending on their habitat, their diet consists mainly of grasses, hay, various plants and herbs, seeds, twigs, bark and occasionally roots.
