Who has a emotional support (legit) dog?

Moriah
Hi. I'm trying to get my dog to be a emotional support animal for flying and I want to be leaving within the month so I'm trying to get all the info ASAP.
Does a emotional support dog have to be trained to go on a plane or just have the paperwork from a doc??
I'm getting mixed answers from friends saying their friends are doing it and they have to be trained before taking it into work (maybe a work place and a airline are different🤔) and another friend saying their friend is training their dog to be a service dog but for a emotional support dog you don't need training you just need to have your doc write you that the dog is, and get a proper ID tag and/or vest for them...
So help if you actually went through this!

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