>>>We had an accidental experiment of the sort. A dog was brought in as a puppy, a day or two old, and has never left the yard. At age of three, it caught a rat like a real pro, knowing exactly how to jump on it and how to break its neck with the first bite. How did it know what to do?
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>>Video rentals?
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>Didn't happen in the US, and it was in the late 70s, so no VCR in the house, and the dog was not allowed inside. It never saw anything but the yard.

Ah. And your sure he wasn't renting them himself and watching them at a neighbour's place? Can you prove he wasn't?