Sentence:  The <WSD>dragsman</WSD>, if regularly employed, may also help about horses and kennels, and work "by the run" (at $5); or for so much per month, or the kennelman may also lay drag, and will be glad of the chance, if an active fellow, as he must be. 
Meaning of the word marked with <WSD> tags:  One who lays down the scent trail for a hunt.