Essential oils are for every living creature, even animals. Not just essential oils, but all herbs.
And again, tobacco is not for the body, neither for the belly, and is not good for man, but is an herb for bruises and all sick cattle, to be used with judgement and skill. Doctrine and Covenants 89:8
Horse care with Essential Oils
Dog care with Essential Oils
Peppermint will keep fleas away.