shotgun joke

A farmer was having problems with a bear climbing up his tree in the back yard, so he hired this guy who came very highly recommended to catch the bear.
The hunter came with a shotgun, rope, and a small dog. He gave the shotgun to the farmer and said, "Stay down here and I'll climb the tree, and shake the branches. When the bear falls, my dog will bite on his nuts, and while the bear is in agony, I'll come down and tie him up with the rope. Okay?"
The farmer nodded his head and asked, "But what is the shotgun for?"
The hunter replied, "Well, sometimes I fall off the tree. In that case, shoot the dog - fast!"