Requirements for an Emotional Support Animal
The difference between a legitimate Emotional Support Animal and a pet is the letter from a licensed therapist. Your pet may already be acting as your ESA however, they are not recognized in the eye of the law until you qualify for an ESA letter.
This important letter is written by a mental health professional, states you suffer from an emotional disability (which falls under the definition laid out by the American’s with Disabilities Act) and the ESA is a vital part of your treatment plan.
The letter must be written on the therapist’s letterhead. It must then be signed and dated and include the physician’s license number, date and place it was issued.
ESA letters are only valid for one year from the issued date.
https://esadoctors.com/esa-laws/