Selling Thoroughbred horses online has never quite caught on in the U.S. as buyers and their advisors are obviously reluctant to purchase a horse they cannot examine in person. But a West Virginia-based auction company is forging ahead with an ambitious online sale later this month, its owners confident that Thoroughbred racing is ready to accept the online marketplace. "In 2000, if you asked me if this is going to work I would have said no," said Tim Jennings, who runs ThoroughbredAuctions.com with his wife, Cathy. "I just didn't think...