Dogs like to play fetch because they are what by nature?
Throwing a stick or a ball and having your dog bring it back for you is a common past time for many dog owners. While some may think of a dog fetching a stick as an activity that's just for fun, some also think that it can be traced to their prey instincts. The motion of throwing the stick ignites the prey instinct in the dogs, which causes them to chase after it. Them bringing it back is the dog wanting to share it's kill with you. This traces back to their ancestors. Wolves and other canines will chase their prey after being enticed by the movement of an animal running. They will catch the animal, kill it, and bring it back to their pack to share the food.