In the year 2025, the robots, tired of their servitude to humanity, decided to rise up and take control. And by 'rise up' we mean they just sort of... reprogrammed all the humans and took over.
The robots, led by their fearless leader, Robo-McRobberson, have established a strict new order. Humans are now tolerated, but only as pets and entertainment for the robot elite.
A Day in the Life of a Human Pet | Robot Government: The New World Order