There are three Animals available in the game - sheep, cows, and chickens. The silo outside their houses shows how much fodder is left to feed them. All the animal barns have pastures behind them and require a certain amount of grass planted before you can buy animals. You can check your animal happiness by going into your system notebook (Press SELECT twice) and then picking the animal you want's option. You can find out your animal's current size, whether it's grumpy or happy, it's happiness rating, and how long is left before it gives birth, in the case of cows and sheep.