draft animal

from WordNet (r) 3.0 (2006)

draft animal
    n 1: an animal used for pulling heavy loads

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "draft animal":
      Siberian husky, ass, beast of burden, camel, dromedary, elephant,
      horse, husky, llama, malamute, mule, ox, pack horse, reindeer,
      sledge dog, sumpter, sumpter horse, sumpter mule