Gorilla Removal

A man came home from work to an escaped gorilla on the roof of his house. He quickly Googled how to remedy this situation and stumbled upon a phone number for a gorilla removal expert.
He called.
When the expert arrived, he hopped out of his truck with a baseball bat, shotgun and his rottweiler.
The expert came over to the homeowner and told him he would climb up on the roof and knock the gorilla off the roof with the baseball bat. When the gorilla landed, the dog would grab on to the gorilla's testicles to subdue it while he restrained it.
He then handed the homeowner the shotgun.
As the expert started to climb up on to the roof, the homeowner asked what the shotgun was for.
The expert told him that if the gorilla knocked him off the roof, shoot the dog.