sled dog

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A dog, such as a Siberian husky, used to pull a dogsled, especially in Arctic regions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any dog, such as a husky, used to pull a sled as part of a team

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a dog trained to draw a sled usually in a team