Actually, I know someone who bought an actuator-controlled electric feeding dish for their cat - to stop their dog from eating all the cat food. Their was a special microchip collar for the cat, and when their cat went near the dish the lid that kept the dog from eating the cat food would lift up - to let the cat eat. The problem is that when their cat goes near the dish, and the lid automatically opens, it freaks out their cat - who runs away. Their dog waits for this, and jumps in to eat the cat food before the lid closes again.
Their was = there was..