Animals in our game are very devoted to their master, so they never run away.
 
You might have noticed the golden statues on the location.
Once fed for a certain number of times, animals turn into golden statues with prizes. For example, a chicken eats 16 times and a cow eats 24 times. Then you need to buy new animals. Animals that you purchased for emeralds turn into golden statues full of prizes as well.