How Long Does ESA Last? March 11th, 2021 Each ESA letter is valid for 12 months after you obtain them from a certified health professional. After one year, you will have to renew your support animal letter. Related Posts Can You Give Fexofenadine to Dogs Suffering from Allergies? What Privileges Do Emotional Support Animals Have? What is the Best Pet for Anxiety? What is the Friendliest Small Pet? [therapypet_step1_form show_in_mobile="1"]