What's the shotgun for?

A man wakes up one morning and found a gorilla on his roof.
So he looks in the yellow pages and sure enough, there's an add for "Gorilla Removers."

he calls the number, and the gorilla remover says he will be over in 30 minutes.
The gorilla remover arrives and gets out of his van.

He's got a LADDER, a BASEBALL BAT, a SHOTGUN and a HUGE DOG.

"What are you going to do", the house owner asks?

I'm going to put this LADDER up against the roof, and then I'm going to go up there and knock the gorilla off the roof with this BASEBALL BAT.
When the gorilla falls off, the DOG is trained to grab the gorilla's testicles and squeeze.
The gorilla will then be subdued enough for me to put him in the cage in the back of the van."

He hands the shotgun to the house owner.

"What's the shotgun for?" asks the house owner.
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If the gorilla knocks ME off the roof, SHOOT THE DOG."