Zoey.

A dead mouse in the driveway led to this discussion about the cats. The kids were wondering which cat may have killed it. They figure it was probably Sammy, but possibly could have been Zelda. I asked why they didn't think Zoey would have done it. The youngest summed it up "She's teeny and poofy and she doesn't go anywhere."
Apparently, the other cats wander a lot but Zoey stays in the yard. I'm not sure what being "teeny" and "poofy" has to do with anything.