Once upon a time, a little and cute dog was playing with his owner ''Sally'' in the house. He was a very happy dog, but he was very young. He had never played with another animal. His name was Dubby and he was very friendly.

But, one day Sally thought that taking Dubby for a walk would be a great idea. So, they went to the park and had a nice afternoon together.

And this was the first time in which Dubby saw another dog that was not him.

He was impressed because he saw different types of dogs. He was wondering why were they of a different color to him? Why were they taller than him? Many questions came to dubby's mine. But, anyway they went back home.

The next day, dubby went to the park again, and he met a new friend. It was a yellow dog. Dubby asked for his name, and the other dog said: ''My name is wocky''. They became friends that day. But there was something that dubby could not explain...

He said: ''I don't know what makes me different to the others dogs. I have two eyes, one nose, four legs and two ears, but they too. What's the difference?''