They calm you down, lower your blood pressure and just make you feel good.
One particular animal helps through visits hospitals, bringing plenty of good medicine.
Zorian is a 27-year-old miniature horse.
He recently visited patients at Lima Memorial Health System's Transitional Care Center in Lima, Ohio.
The mini horse is a service animal and visits with those in the hospital, helping to replace the pain and suffering of the patients with smiles, for at least a little while.
Mini Adventures Inc. out of Waynesfield, Ohio brings the horses around to hospitals, nursing homes and assisted living facilities as a type of pet therapy.
Mini Adventures is a non profit organization and relies on donations to help take care of the horses.