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 Do Emotional Support Animals Pay Pet Rent? Do Dogs Forget People? Can I Get a Therapy Dog for Anxiety? Understanding Dog Emotions and Behavior [therapypet_step1_form show_in_mobile="1"]