A few months ago we had a rat who would come up to the window and make faces at the cats. Drove them crazy! So they told the dog, who is allowed outside. The next day the dog goes racing out the door, down the steps, crunch, snap, dead rat. Dog got a new bone for her efforts and the admirations of cats and humans alike. Funny we haven't seen a rat since. It is amusing that dogs share our distaste for rats. Birds, squirrels and chipmonks are welcome. No Rats.