Here's how:
* Early Game: You can buy chickens and cows from the Animal Shop (the green building with the animal silhouette) in town.
* Specific Animals:
* Chickens: Available immediately.
* Cows: Available immediately.
* Sheep: Unlocked after reaching the "Friendly" level with the townspeople.
* Horses: Unlocked later in the game, but their specific requirements might vary depending on which version you're playing.
Tip: The Animal Shop might initially have limited stock, so check back regularly.