As has been stated, guinea pigs need hay. Also, try and follow the advice given, especially if it means a happier life for your piggies *and* you. My husband is highly allergic to Timothy hay, as we discovered, but we combat this with an air purifier, simple meds, and the fact that he loves them as much as I. We went out today and picked up Oxbow orchard grass, and already he seems better. On the note about the vets, they certainly aren't always the best place for advice, considering that the one who handled my Potter before I got him said he should be put down for a treatable abscess. He is a healthy piggy now. Just do what's best for the pigs in the long run, if you love them.