My cat is at war with my RoboRock S6 Pure.  She's learned that she can defeat the robot by knocking the charging dock over.

What we need is a heavier dock.  I built a piece which fits over the top of the standard charger dock.  It's hollow, and I filled it full of concrete.  This doesn't interfere with the robot in any way, but it makes the charger way too heavy for the cat to knock over.