I thought this part was interesting:

Performing “work or tasks” means that the dog is trained to take a specific action when needed to assist the person with a disability.

o If the individual identifies at least one action the dog is trained to take which is helpful to the disability other than emotional support, the dog should be considered a service animal and permitted in housing, including public and common use areas. Housing providers should not make further inquiries.

o If no specific work or task is identified, the dog should not be considered a service animal but may be another type of animal for which a reasonable accommodation may be required. Emotional support, comfort, well-being, and companionship are not a specific work or task for purposes of analysis under the ADA.