SWAT fly ointment is a natural pyrethrin formula that repels horse flies, stable flies, face flies, and horn flies on horses, ponies, and even dogs. The fly ointment kills insects on contact. The horse fly cream is ideal for use on facial areas or around open wounds and should be applied daily for the most effective insect control. SWAT can be used as a fly repellant ointment for dogs as a general repellant or around wounds.