Veterinarian: A disease of purebred racehorses that is caused by a genetic defect prevents afflicted horses from racing and can cause paralysis and death  Some horse breeders conclude that because the disease can have such serious consequences, horses with this defect should not be bred
But they are wrong because, in most cases, the severity of the disease can be controlled by diet and medication, and the defect also produces horses of extreme beauty that are in great demand in the horse show industry
There should be no prohibition against breeding racehorses that have any disease that can be controlled by diet and exercise.