The first Sunday in September marks National Pet Rock Day each year, this year on September 3. For those who don’t know what they are, what rock have you been hiding under? Not a pet rock for sure. Pet rocks are extraordinary pets adopted by hundreds across the country. You might wonder why someone would keep a rock as a pet. Well, think about it. Rocks don’t need grooming, they don’t require visits to the vet, they don’t eat, never get sick, and, best of all — they never die!