My horse has a cut on its leg. Which spray should I use to help it heal?

It depends on the age of the cut. Fresh clean wounds are best treated with Chloromide as it has antiseptics, fly repellents and a bittering agent to stop licking. If the wound is older then Debrisol has enzymes that gently remove dead and decaying tissue. Foe a deeper ulcer Wound Powder will promote granulation tissue.