Sheep and goats

English: Hurricane, Utah, July 2009

English: Hurricane, Utah, July 2009 (Photo credit: Wikipedia)

Yesterday, my wife and I were driving in a rural part of Hurricane, Utah when we saw a pasture stocked with a mix of sheep and goats. I jokingly asked my wife how to tell the difference. She said that the woolly ones were the sheep. On the other hand, I look for the bony ones with horns which are the goats. Two different ways at looking at the same question. How do you distinguish between the sheep and the goats?