Just to be clear, service animals will simply need documentation indicating they're vaccinated. Emotional support animals will be required to have the other letter as well.
This is a link from the Delta website to the vaccination record information and form for Service Dogs:
https://www.delta.com/content/dam/delta-www/pdfs/policy/TrainedServiceAnimal-RequiredForms.pdf
The ADA FAQs Page does make it clear that Service Dogs are still required to be vaccinated:
https://www.ada.gov/regs2010/service_animal_qa.html
I saw this the other day and there's one part that caught my eye. The linked article only designates between service animals and emotional support animals, but several other articles I saw list psychiatric service dogs in with emotional support animals. Service dogs for physical disabilities, seizure alert dogs, and diabetes alert dogs are only required to submit the vaccination records. But owners of psychiatric service dogs must sign the same letter as those with ESAs. While I'm sure owners of psychiatric service dogs will have no problem signing the letter since their dogs are fully trained, it's troubling to me that Delta is applying different standards to service animals based on the disability. Why not make all service dog owners sign the letter?
It’s true that Delta is including them together. The ADA doesn’t include Emotional Support and Psychiatric Service Dogs together, but airlines are not included in the ADA.
Airlines are covered under the Air Carrier Access Act, which does put Emotional Support and Psychiatric Service Dogs together. This link explains the law:
https://www.law.cornell.edu/cfr/text/14/382.117
This is the link to the Delta forms for Emotional Support and Psychiatric Service Animals.
https://www.delta.com/content/dam/delta-www/pdfs/policy/EmotionalSupportAnimal-RequiredForms.pdf
Psychiatric Service Dogs have been trained to observe the person they are working with for signs of stress/other symptoms of the person’s condition or situations that might cause issues related to the person’s disability. When the dog detects some issue, it has been trained to do some specific work or task to alert the human or interrupt the issue. By definition, a Service Dog has been individually trained to do some specific task or work to lessen the impact of the disability.
Emotional Support Animals have not been taught to detect any issues or to do anything specific; the animal is basically there for the human to pet when they feel stressed. That does not meet the definition of “service” because dogs don’t need any training to be petted; in fact, the ADA specifically says being petted or just being present does not qualify.
I’ve seen many dogs at WDW in lines, at resorts and on buses that are obviously not well trained. I’ve heard a number of people explain/teach people about these “Service Dogs”, sometimes using names like “Emotional Support Service Dog, PTSD Service Dog, Agoraphobia Service Dog, Psychiatric Service Dog”. In almost every explanation I’ve heard, the “service” the dog “provides” is being present so the person can pet it. And, the person often encourages other people to pet their “service dog” because it is “relaxing”.
My guess is that the Air Carrier Access Act puts Psychiatric Service Dogs with Emotional Support Animals since many people with Emotional Support Animals think their dog is a Service Dog when it really isn’t.
On one trip, I was on the bus multiple times with the same woman and heard her explanation each time; that she needed him with her so she could pet him and she had anxiety if he was not with her. She also complained that some WDW CMs did not understand Service Dogs because they “interfered with his ability to work” by making her put her large bag with dog on the floor where she could not reach him for many rides (or even on some rides, he was not allowed at all). It was pretty clear she thought he was a true Service Dog, even though he was not trained to do anything and did nothing the average pet would not do. It was also clear from watching her that she had pretty severe anxiety/mental health issues and might have benefitted from a dog that had been trained to interrupt them.
But, that did not make her pet a Service Dog (and, in fact, her dog looked pretty stressed at times because as she got louder and appeared more stressed, she petted him faster and harder).