A few points:
II. Service Animal Defined by Title II and Title III of the ADA
A service animal means any dog that is individually trained to do work or perform tasks for the benefit of an individual with a disability, including a physical, sensory, psychiatric, intellectual, or other mental disability. Tasks performed can include, among other things, pulling a wheelchair, retrieving dropped items, alerting a person to a sound, reminding a person to take medication, or pressing an elevator button.
Emotional support animals, comfort animals, and therapy dogs are not service animals under Title II and Title III of the ADA. Other species of animals, whether wild or domestic, trained or untrained, are not considered service animals either. The work or tasks performed by a service animal must be directly related to the individual’s disability. It does not matter if a person has a note from a doctor that states that the person has a disability and needs to have the animal for emotional support. A doctor’s letter does not turn an animal into a service animal.
Ed: I'll point out that the ADA definition specifically addresses PTSD, "....
calming a person with Post Traumatic Stress Disorder (PTSD) during an anxiety attack...."
ADA protections apply to SERVICE animals. (see ADA citation below)
ACAA protections apply to service animals (with the ADA) but
also apply to emotional support animals (ESA).
FHA and ADA rules apply to housing
EEOC enforces the ADA and applies to the workplace and accommodation.
IDEA and the ADA apply to educational situations: schools, universities etc...
The Air Carrier Access Act (ACAA) requires airlines to allow
service animals and emotional support animals to accompany their handlers in the cabin of the aircraft.
The rules differ for SA's and ESA's and are expanded in the citation below.
An interesting discussion: Are timeshares residential housing occupied by 'owners' or are they public accommodation? The application of the laws (ADA) applying to service animals in public facilities and accommodations may be quite different from those laws that apply to housing and reasonable accommodations (FHA).
If you're really interested and/or feel 'mad' or 'angry' or 'frightened' or "curious" etc... perhaps you should read some of the material and gain a better understanding.
Point of fact: the Federal Gov. has (and is) trying to revise the training/certification/documentation requirements for service animals, but has been unsuccessful to date. Many states (20?) are attempting to crack-down on 'fake' service animals with legislation and enforcement, but the efforts are complicated and often blocked by the current vague and overriding Federal law
As I've said before: Genuine service animals are not the problem. It's the people on the "it's all about me" program with their 'eBay' jackets and internet letters that are causing the problems. Further, I mean no insult to the folks who have a genuine necessity for an ESA, but I highlight the difficulty in drawing a definitive and legal line between "need vs want" and "nice vs necessary."
https://www.ada.gov/service_animals_2010.htm
https://adata.org/publication/service-animals-booklet
All IMO, of course....