We found one dictionary that defines the word work animals:

General (1 matching dictionary)

1. work animals: Vocabulary.com

(Note: See work_animal as well.)

Definitions from WordNet (work animal) ▸ noun:  an animal trained for and used for heavy labor ▸ Also see work_animal ▸ Words similar to work animals ▸ Usage examples for work animals ▸ Idioms related to work animals ▸ Wikipedia articles (New!) ▸ Words that often appear near work animals ▸ Rhymes of work animals ▸ Invented words related to work animals