One day, a big dog and a little cat met in the park. The dog had a red ball, and the cat had a small toy mouse. They both looked at each other's toys and felt a bit guilty for wanting them. 
"Can we trade toys?" asked the dog, as he nodded his head. The cat nodded back and said, "Yes, we can trade."
So, the dog gave his red ball to the cat, and the cat gave her toy mouse to the dog. They played happily with their new toys and became good friends. They learned that sharing and trading can be fun.
