A small amount of grain as a "treat" wouldn't hurt, but his main staple should be a good quality mixed grass hay and always a loose mineral...I feed all my goats, bucks and does a "goat feed"...it has the correct ratio of phosphorus and calcium in proportion to the feed itself, so it's pretty balanced, I've not had an issue with urinary calculi (yet)...I do provide a loose mineral with added ammonium chloride as a "safety" measure and though the boys get just a half cup each, the older buck will get more as he pushes the young ones away...they get browse as well as mixed grass/timothy hay and LOTS of water this works for me, but may not work for you....you can get a feed that has ammonium chloride allready in it and give that instead of a "sweet" feed, but beware....pygmy's tend to get "beefy" ....too much grain and they get too fat, it's the breed. If you feel you decide to not grain him and worry about his condition, run your hand down his back...you should be able to feel his spine, not have to dig for it or even hane it feel "like a razor blade"....if he feels good to you then you know he is getting what he needs to grow.
Hope this helped you. :wink: