Here's what rhymes with sheeptail.
pale tail tale jail bail bale dale pail detail male fail mail sale sail trail nail rail veil gale hail shale whale stale vale wail hale braille kale faille wale scale avail entail frail email assail curtail quail snail flail quale bewail derail pigtail topsail grail impale bobtail hightail prevail travail inhale ponytail unveil foresail taffrail wassail pellmell carrell exhale gunwale mainsail monorail swallowtail hangnail lugsail fingernail countervail martingale nonpareil tattletale