An ESA letter can be signed and written by a licensed mental health practitioner to be valid. A healthcare expert, such as a psychiatrist or doctor, can also sign an ESA letter. You can quickly get emotional support animal letter.The ESA letter must be signed and dated by the professional who wrote it, including their licensing information. The ESA letter must also explicitly state that the patient has a confirmed disability and that the ESA is providing assistance to the patient.You can contact your doctor to get an ESA letter.All Rights Reserved