It's called the "teddy bear dog." Half shih-tzu and half bichon frise. In Canada we refer to the Shih-Tzu and Bichon Frise cross as Mollydogs instead of teddy bear dogs. I have two of them and they are wonderful.
Maltese Maltese are also the small dog breed that comes under Toy Group. Toy group is a name given to the small dog breeds. It is believed that they have descends from the dogs in the Central Mediterranean Area.