NSLM - Crossword Labs

2. "Still Water" sculptor
6. A huntsman's assistant in the field
9. Player's skill level, as in polo or golf
11. Word yelled to trigger the release of a target when shooting
13. A two-beat gait
14. "Canter & Crawl" sculptress
15. Author of "Riding to Hounds on Long Island," informally
18. A pair of hounds
19. Driving configuration with one leader in front and two wheelers in back
21. Born on this day in 1795, this man developed a popular breed of small fox terrier that was later named after him

1. Piece of metal tack that goes in a horse's mouth
3. French word for "training," also an Olympic sport
4. "___ in America," the first exhibition held at the Museum in 2011
5. This dog, whose breed was created by 21-Across, starred in an eponymous PBS TV show in the late 1990s that taught kids about literary classics
7. the NSLM's rare book collection includes over 90 copies of "The Compleat ___," first written by Izaak Walton in 1653
8. 1973 Triple Crown Champ, informally
10. "Call to the ___" is played by a bugler before every race
11. Competition over a single fence set at great height
12. Small flock of game-birds
16. Artificial duck, often finely crafted from wood
17. One of four to six in a polo match
20. National Sporting Library & Museum