My mom's guinea pig is having allergies to timothy hay. He gets itchy. We put a humidifier near his cage. No help at all. We even have had him treated with revolution at the vet for any possible external mites or parasites. We had a test done for internal parasites, he has none. The timothy hay makes him sneeze a bit. I have allergies to it too. We tried bluegrass and timothy from kms he won't eat it. We tried oxbow orchard grass. He won't eat it. What should we do for hay?