What do i need to register my dog as Emotional support

If you are using the dog as a service animal , such as taking public transportation and to be in certain places with an animal , you need to register them as such. That's the only reason I would presume .Do you need the animal for that kind of support ?. If you do there's your answer

Best if you give them a call

I don't work there check on line please.

Google that one. Not sure ASPCA supplies that..