Monkey in a Tree

A man notices a monkey is up in his backyard tree.
He goes online and finds a man who specializes in monkey capture and removal.
When the trapper arrives at the house he shows up with a stick, a set of handcuffs, a Chihuahua, and a shotgun.
He tells the homeowner "I'm going to climb up in the tree and use this stick to hit the monkey until it falls out of the tree. When it lands, the trained Chihuahua will viciously lunge for the monkey's genitals and when it attempts to protect himself I will slap on the handcuffs."
The homeowner, a little bewildered, says "that's crazy enough it just might work, but what’s the shotgun for?"
"In case I fall out of the tree first....you must shoot the Chihuahua."