A game where two people (or dogs) pull on two ends of a rope, each one trying to drag the other one.

dogs playing tug of war with a rope
The two dogs are playing tug of war with a rope.
Two golden retrievers are in the water tugging on each end of a rope.photo by veganstraightedge http://www.flickr.com/photos/veganstraightedge/3242711992/