You beat me to it...the best gun for a non-gun people is a dog - preferably a loud, little yappy one. I don't know of anyone that want to be bitten by a dog, irrespective of breed or size, nor anyone who wants to be shot with a firearm. Augment the dog with a baseball bat, or a can of hornet/wasp spray, and then follow with them taking lessons from a competent trainer.

Good luck,

Dave

PS - Whoops - sorry, I didn't read all the responses before responding. Okay, I still vote for loud, yappy dog, and I agree that maybe a nice double barrel 20 ga. shotgun would probably work for them. They can rubber band a flashlight beneath the barrels and be set for night time use as well. I also agree that the buttstock shell holder would be useful as well.

Good luck,

Dave