One of our mouse (the one who has been bitten several times by it's cage-mate) has now started leaning over to one side and looks like I would expect her to if she had had a stroke.
Do mice have strokes? Or could the other have bitten it and paralysed it?
We have booked an appointment at the vets straight after work tomorrow night to get her checked out and have got another cage ready to split them up, but we just wanted other people's views.
We took her out and she moves around fine (although she is leaning a lot), and she had a chew on some food, so she is otherwise healthy.