The 37-year-old Irish import Jerry O’Dwyer showed up at Laurel Park early in 2017 with three horses and hopes of finding his way as a head horse trainer. It worked. O’Dwyer won 10 races in 2017 and 17 in 2018. His stable swelled to as many as 18 horses this past summer, and though he is down to 10 active runners for winter racing in Maryland, there are a half-dozen or so 2-year-olds slated to stock the barn in the spring.