Hi all. New to backyard herds and sheep. We are getting a 1 and 3yr old babydoll Southdown wethers in the next week and need help knowing how to control their weight. We went and looked at the boys and they are super friendly but the 3yr old is huge! The owners said he is on hay and hay extender and used to be on a sweet feed? But he got "crazy" on it. They couldn't tell me what kind of hay. Any tips on getting his weight under control? Thanks!