Absolutely agree with Parus. There's no official registry for Emotional Support Animals or Service Dogs (they are two different things with different rights) in the USA, and any online company that says otherwise is a scam. ESAs must be 'prescribed' by a doctor, though the doctor does not need to reveal what they were prescribed for, simply that it's their professional opinion that an ESA is beneficial to you. Confirmation from an appropriate health care provider is typically required by landlords and by airlines when taking the animal on flights in-cabin, as ESAs only have special rights when it comes to housing and flying (ie they have no public access rights, can't go into stores where pets aren't allowed, etc).