By definition, the word "holistic" means: "relating to or concerned with wholes or complete systems rather than with the analysis of, treatment of, or dissection into parts -- medicine which attempts to treat both the mind and the body."
As such, true holistic therapies must include more than just a set of symptoms to be addressed. They must consider the WHOLE being, whether human or animal, including the emotional, mental, and physical (both internal and external) environments in which they exist.
Some examples of holistic approaches include Herbalism, Homeopathy, Acupuncture, TCM (Traditional Chinese Medicine), and Ayurveda (an ancient approach from India).