Peter Stein/News-Sun Susie Prather isn’t happy. Denny Crozier is ticked. Prather and Crozier are local horse breeders who feel like their business and other local businesses are being squeezed because horse racing at Zia Park and racetracks throughout the state has been progressively cut back in recent years. That constrains the businesses of breeders, trainers, local restaurants and hotels. It’s …