Gorilla Hunt

There were two guys that went to hunt for a gorilla for the zoo. Since they had to catch it alive, they went prepared. They had a pair of handcuffs, a high power rifle and a Chihuahua.
One of the guys asked the other what all the stuff was for.
His friend replied: First I am going to go up in the tree and shake him out, when he hits the ground, the dog will run up and bite him on the nuts and then we handcuff him.
Then the first guy asked what the high power rifle was for?
His friend responded: In case he shakes me out of the tree first, you shoot the dog.