Examples from the Web for mouser
"Well, I can't say that we are," Mrs. Mouser replied thoughtfully.Mouser Cats' Story|Amy Prentice
Gentle as a lamb—soft as butter—kind as cream—and such a mouser!Eugene Aram, Complete|Edward Bulwer-Lytton
The Duke is now a little too old a mouser to enjoy Tory tricks.
Only when poised for its final spring upon the helpless prey was it seen that Mouser stalked the blue jay on its perch.The Wrong Twin|Harry Leon Wilson
Nor is puss to be admired only for these winning qualities, and her utility as a mouser.Illustrative Anecdotes of the Animal Kingdom|Samuel Griswold Goodrich
British Dictionary definitions for mouser
Word Origin and History for mouser
"cat that hunts mice," c.1400, agent noun from mouse (v.).