Little cat run after mouse

Catsy, catsy, where are you? Always jumping over the wall. Always running after little mouse. Sometimes get him, sometimes don't. Little mouse has a little hole in the wall. And I know where. You know where too. You can't get in. Of course, I can't get in either. Little cat, little cat, although you always are cruel to the mouse, you're still a nice creature to have around, unless I am allergic to you.