I don't have a mouse. I know most self-respecting cats have a mouse to bat around and bite. Instead of a mouse I have a fish. He's red and yellow and he glimmers in the sunlight. I love my fishy. I once put him in my water bowl so he could swim, but Jen took him out and told me that he doesn't like the water (a fish after my own heart.) I don't have a name for my fishy yet. Any suggestions?