Manna Pro Pro-Force Fly Spray is a fly repellent for use on horses, ponies, dogs and as a premise spray. Pro-Force kills and repels more than 70 listed species, including biting and nuisance flies, horse flies, ticks, gnats and mosquitoes. It also kills fleas and ticks on dogs. Pro-Force rapidly knocks down, kills and repels for up to 14 days. This ready-to-use formula requires no mixing.