The Chief comes out of his tepee where his wife had just given birth of his 4th child.  His son asks what he planned to call this one.  He looked around and noticed a female deer running through the meadow.  He looked at his son and said " she will be know as Running Doe.  I named your brother Climbing Bear because I saw a bear climbing a tree for honey, and your sister Two Deer because that is what I saw when I came out of the tepee,  tell me Two Dogs Screwing, why do you ask?"