I used to crochet sweaters for Basenjis and other breeds. I sold them on e-bay by the hundred in aid of Basenji Rescue. Dogs loved them and they wash easily and last for years. You can see them on my much neglected website.
www.zandebasenjis.com/warmth.htm[link text](link url) and there are loads more on the next page if you scroll down.
I can let anyone have the pattern cos I only have a couple here (new) I made for my own support team.