An animal, such as a mule, used to carry loads.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "pack animal" in a sentence
"Muggsie, the faithful collie, soon abandoned to a back porch at her in-laws’ while she went on calls to seduce the lens, languished as only a pack animal can languish."