Thanks for all your suggestions guys
I don't have to worry about it fitting more than one mouse, because Yankee lives alone. He used to live with his brother, Doodle, until he tried to kill him. So now they both live alone, and Doodle lives with my cousin. So the bit about the SS only accommodating one mouse doesn't necessarily apply to me
Although I do appreciate all of your advice! I'll keep that in mind if I ever get a group of girls
