Personal Support or Emotional Support Animals are allowed and are granted the same privileges. This is usually issued to someone who has anxiety or other issues of that nature.
However, you can't just get a vest, you have to have a letter from your doctor or psychologist stating the medical need for this ESA and the letter must be re-issued once a year.
Not to say that people can't just go and get a vest, but airlines and hotels will typically ask for the letter as well.
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