I'd say it's probably one of the german spitzes. They can come in parti color, and technically both the keeshonden and the poms and the american eskimos are all pretty much german spitzes, with slight differences between them.
They're going to be more common then the icelandic sheep dog here in America. And...poms can get really big. I met a pom that was 30 lbs and the owner was sure it was a "pure breed."