Aromatherapy is an excellent natural therapy for horses and dogs, not for cats though. Aromatherapy is the use of essential oils as a therapy to certain physical and mental ailments. When essential oils penetrate the bloodstream, they release their components that act on the various systems of the body and promote self-healing.
Animals react well to it and it is easy to use as long as you know which essential oils to use on your pets.
Here are the profiles of the herbs that can be given to horses. Don't forget that herbs are medicine and you should consult your veterinarian when required.