How To Write A Letter For Emotional Support Animal . The full list of who can write esa letters includes: Limit the letter to fit the exact need. Emotional Support Dog Letter Template Collection Letter Templates For from www.pinterest.com Any licensed mental health professional can write esa letters and state the pet is part of your therapy treatment plan. With a legitimate esa letter, your emotional support animal can legally live in 99. Schedule an office visit or work with a licensed professional online through a reputable website like esadoctors.com.