On the first day, God created the Dog.

 On the second day, God created man to serve the dog.

 On the third day, God created all the animals of the earth to serve as
 potential food for the dog.

 On the fourth day, God created honest toil so that man could labor
 for the good of the dog.

 On the fifth day, God created the tennis ball so that the dog might
 or might not retrieve it.

 On the sixth day, God created veterinary science to keep the dog
 healthy and the man broke.

 On the seventh day, God tried to rest, but He had to walk the dog.