Oxbow’s Essentials - Adult Guinea Pig Food is formulated to meet the specific nutritional needs of adult guinea pigs and help them thrive. This complete and balanced adult guinea pig food contains Timothy hay for healthy digestion and all the wholesome ingredients and vital nutrients needed to support daily function and performance. Seventy percent of your guinea pig's diet should be grass hay. Oxbow offers a variety of hand-selected, high-fiber hays to enrich the life and health of your pet.