Guinea pigs need to eat a balance of fresh vegetables, pellets and timothy hay (also known as common cat’s tail) to support healthy digestion. Since they also sleep and play in hay—and hay also acts as a dentist that keeps their teeth shapely and smooth—it’s pretty much their everything, so you should know what to look for when it’s time to buy it.
This mix of first and second cuttings is high in fiber, which is good for your guinea pig’s digestion. Kaytee
One major term to know when shopping this category of product is whether the mix you’re buying consists of first or second cuttings. If it’s the former (or a mix of both, as is most common), some of the stems and such will be thicker and heartier, with more fiber but perhaps less rodential appeal.
A soft mix that includes seed-head, leaf and stems for happier grazing. Small Pet Select
Products that have undergone a secondary clipping are less tough on a guinea pig’s cute little lips and still have plenty of fiber to be worthwhile.
Fruits, herbs and flowers offer a tasty occasional delight. Kaytee
Once in a while, a small piece of fresh fruit is an acceptable offering for your guinea pig. You can also consider dry products that include bits of fruit or vegetables, but don’t be surprised if your guinea cherry-picks them from the dry mix, so to speak.