It is generally not a good idea to give animals drugs that are designed for human use, including medications for mental illness. Animals and humans have different physiology and metabolize drugs differently, so a medication that is safe and effective for a human may be harmful or ineffective for an animal. In addition, mental illness in animals is not the same as mental illness in humans, so using human medications to treat mental illness in animals may not be effective. It is always best to consult with a veterinarian before giving any medication to an animal.