You can buy balls for your animals to play with. They will kick the ball around the field to others.
There are 4 kinds of balls:
- Basketball, which costs 100,000 coins or 5 discobux
- Soccerball, which costs 250,000 coins or 10 discobux
- Beach Ball, which costs 500,000 coins or 25 discobux
- Diamond Ball, which costs 1,000,000 coins or 50 discobux
The kinds of the balls look to be cosmetic only, the animals do not seem to act differently between the diamond ball and the basketball.