It was a sorry nag and dragged a two wheeled cart and was unable to move except in a jerky sort of gallop. "Romance of the Rabbit" by Francis Jammes

But the jester, rolling on his nag after a merry fashion, till the bells in his cap rang again, answered him: " Nay, Nunkey, would you tempt a Christian to walk on the ice? "The Complete Historical Romances of Georg Ebers" by Georg Ebers

Any man with a nag who fails to bring it up for muster should be hanged for treason. "Caribbee" by Thomas Hoover

Just the same you never heard me nag for trips. "Every Soul Hath Its Song" by Fannie Hurst

Yes, it's his old nag. "Moor Fires" by E. H. (Emily Hilda) Young