Looking for a pet who, instead of needing to be cleaned up after, does the cleaning? The future might provide exactly what you want: check out SpotMini, the latest robot to be unveiled by Boston Dynamics.
SpotMini, weighing in at just 55 lbs (65 lbs if you include its arm), is all-electric (no hydraulics) and "runs for about 90 minutes on a charge, depending on what it is doing":
It also has a variety of sensors, including depth cameras, a solid state gyro (IMU) and proprioception sensors in the limbs. These sensors help with navigation and mobile manipulation. SpotMini performs some tasks autonomously, but often uses a human for high-level guidance. For more information about SpotMini visit our website at www.BostonDynamics.com
The good news: the first defence against any robot rebellion will, apparently, be banana skins.
The bad news: If you watch the video at the top of the post, it doesn't slow them down for long...