Definition of a lake: a large body of water surrounded by land.
Definition of a pond: a small body of water formed naturally or by hollowing or embanking.
Definition of a puddle: a small pool of liquid.
I looked up these definitions to determine if Phoebe was leaving a puddle or a pond behind when she was doing her business inside the house. When she goes outside it is tiny, but inside it is beyond a puddle, and I think it is fair to say it is a pond. Of course, Cooper now thinks it is fair game again to do his business inside too, so our house is really just so wonderful. I am afraid they will get into a competition as to who gets to form the first lake.