Why Walk a Dog?

Why does a dog need to be walked? Three birds fighting out in the yard But I don't know what they're fighting about So why does a dog need to listen Whenever you shout? These cats seem to blow Everyone's mind, but mine What is so funny About beasts above understanding? Are you their master? Did you buy them at the store? Did they know they were a cure For you to stop being bored? So somebody mated them And took their babies away from them Stuck a price tag on their nose And now you're buying it clothes So, why does a dog need to be walked?