Ok so this as been bugging me for years, I saw a film and the plot was basically this young mouse (boy) who was separated from his family because he fell of a boat in a storm and then he arrived in this sort of mouse city and he found this place to stay, sort of like an inn [?], I can't remember an ending but near the end the mouse city was invaded by this huge cat machine thingy. If it helps the young mouse was wearing this big red top and a blue hat.

Isn't that film called 'An American Tail'?? I could be completely wrong but that rings a bell... :)

American tail, feaver goes west or something

An American Tail ?