Is Melatonin Safe For Dogs? Dr. Sarah Sims2016-11-02T10:06:18-06:00 Melatonin is known by many as the “sleep hormone.” It is produced by a small part of the brain called the Pineal Gland when the eyes sense darkness. Is Melatonin Safe For Dogs?Dr. Sarah Sims2016-11-02T10:06:18-06:00