O.K. So I'm told this is the site to register an emotional support animal in the USA. Someone here on PC gave me this answer. I did it and it only cost me $79.00 and they do issue a registration number that can be looked up by any establishment with questions about it's legitimacy. They can even see a picture of your animal there. I'll update you if it does or does not work for anyone interested.

https//www.registermyserviceanimal.com/emotional-support-animal-requirements.html