Mouse on a cat on a dog

Now that I can retrieve photos from my camera phone, I can show you one of the more unusual sights that I've recently seen. I can say that I had never before seen a mouse perched on top of a cat, let alone one that was perched on top of a dog. Until I saw this:

All three animals were quite alive and were looking around at people who passed by. The cat and mouse shifted their weight regularly in an effort to keep balance.