Protecting her cat eggs
This story isn’t about how a pet cat conditioned its human to do something, but rather how observing its surroundings made the cat adjust its behavior. As we all know, cats don’t lay eggs (at least, we think so), but after this feline caught sight of a crow tending to its nest, the cat had a brilliant idea.
From then on, whenever there were eggs in the OP’s home, the cat would rest atop the eggs and guard them with its life. This is probably the only incident in the world where a cat keeps a watchful eye over the well-being of chicken eggs.