Max Brand 
The Stolen Stallion 

Many men had set out to capture a magnificent stallion named Parade, but none had yet triumphed through the hardships to gain the ultimate prize. Silvertip was a dangerous cowboy who could rip out the heart of a mountain lion with his bare hands and when he hunted Parade he took only a rope and raw courage. But trailing him, guns at their sides, were two killers who wanted the cowboy as badly as they wanted the horse!