boy or girl mouse?

Question

stuart   hello i have two mice which i bought at separate times one i know is a girl but im unsure about the second one because as i was paying for it the man at the pet shop went and got it, he reckoned its a girl but i think it looks different. plzzzzzz help

Answer
Dear Nick,

Boy.  Don't put them together unless you are ready for a huge project.

Here is help to tell next time:

http://www.thefunmouse.com/info/sexing.cfm

Good job that you doubted the pet store attendant. Those people just don't know what they are talking about!!

squeaks and giggles,

Natasha