We have 4 acres right behind the house in weeds right now, and have thought of getting sheep, not only to keep the grasses down, but for $$ from wool, meat. now, the questions-can sheep use a 3 sided shelter? we are in NW Ohio, and the winters can get a little rough...where does one sell the wool? And, do they alsoeat grain, hay? I know about horses, but not sheep! Thanks!