First reaction, of course, is an 'outside the box' issue, but I don't believe that's the case. Eating / acting normally, but simply no urine (or very little) to scoop out as usual (typically a good bit of it). I DO, however, seem to recall going through this whole thing before. I have stopped adding as much water to her canned food (always add some since I mix in the contents on an antinol pill once a day). Worth a vet appointment if it continues I'd say. Thanks for any thoughts.