Chief and Archer prove that tired legs do not stop a good game. This video of dogs playing catches them mid-yard, already worn out, yet still locked in. The best part is how they ignore the open door.

This is the hilarious moment a pair of dogs play-fighting in a park in Miami, Florida on August 21 look like they're engaging in a boxing match. CBS News ousts top '60 Minutes' staff, hires Nick ...

For decades I've thought about how a simple behavior such as stretching and crouching on the forelimbs could become a play invitation signal in dogs and other animals. Many people also have asked me ...