One of the many I have heard over the years goes like this:
A JW couldn't reach the doorbell because a wrought iron fence encircled the home. So, he banged on the bars and a big German Shepherd came running up and pushed the gate open. Thinking fast the JW shoved a Watchtower into his mouth and said, "take me to your master". The dog calmed down and dutifully trotted away. So, he followed. He found the owner of the house far back in the back yard.
A discussion ensued and the HH remarked that his dog had never acted like that to anyone before because he was a trained guard dog. He took the literature and later accepted a home bible study. Last report was that he was making fine progress along the road to life.
Not sure if the German Shepherd ate his spiritual food as well.