From Edward Medalis:

Re: Built-in brain “templates” may clue tots to threats (Sept. 18): Related to this article is a personal experience. I bought a miniature Schnauzer dog as a pup. Very soon after bringing her home I was watching her play in the backyard. Earlier, a chair had been spray painted in the yard and a snake like black line was left in the grass. When the pup romped close to the black line it all of a sudden jumped high sideways away from the line and her previous direction of travel. This pup had never seen a real snake and was not startled by any noise. It was very apparent that the pup was dramatically frightened by the line. I concluded that it was highly probable that this fear was realized due to factors not learned by experience in its young life.