animation - Christmassy movie about a rat in a toy store

I suddenly remembered seeing a movie on T.V. when I was a kid. I have no idea what the story was about, but I remember the following things:

• was animated in a very distinct non-Disney style (unlike anything else either, I recall shakily drawn characters)


• main villain was a rat


• a major scene took place around toys, maybe in a toy store


• it was kind of Christmas/holiday themed or maybe just took place in the winter season.

I remember that it was very strange, but I really liked it. I will know it if I see a picture of it for sure. I have looked through Wikipedia's list of fictional rodents page but couldn't find what I was looking for there either.

If anyone can help, and further more, knows if it's available on DVD that would be great.