One of my pits will fetch whichever of 5 colors and two types of ball she is told to get, in addition to an assortment of other toys, regardless of who gives the command (after that person has passed the acceptance test).

The other one bless her heart couldn't find her way out of an empty room with one open exit unless it involved food. As far as I can tell her only two thoughts are eating and being petted.

My cats....well......snakes with fur comes to mind. Cunning,devious, but just not real bright,,,,anything that wakes me up before 5:00 a.m. in a non-emergency situation lacks a certain instinct for self preservation.