sentences:  There are also cases where true geldings exhibit aggressive or stallion-like behavior, sometimes called "false rigs", but their behavior is not hormone-driven and can sometimes be corrected with proper training and discipline.The condition is considered heritable, but a genetic link has yet to be proven.Horses of any breed may be ridgelings, but Quarter Horses, Saddlebreds, Percherons, and ponies seem to be more likely to exhibit the condition.