Does my guinea pig need hay or alfalfa? - Brooks-Falls Veterinary Hospital
Definitely hay. Timothy and Medowgrass hay are great when they're an adult. Alfalfa is good for youngsters. Alfalfa hay is the best when they're under six months of age. But after that, we don't want to offer it anymore because it's really high in calcium, so it can cause them to have bladder stones or just become obese because of the extra nutrients in it.
Contributed by Molly Kase DVM
from Brook-Falls Veterinary Hospital & Exotic Care, Inc.