Through various articles and ADA rule readings over the years, I found the following interesting:
1. If a person needs a service animal, it needs to be with them continuously. That is, they can't go out to dinner and leave the dog on the deck or alone in the unit.
2. If a dog is causing a nuisance like barking (without reason/performing a service) or threatening people, the owner can be directed to remove it from the property - - even if it IS an actual service dog.
Last year at Marriott Newport Coast, when we were out on the lanai, the dog from the adjacent unit would bark at us continuously. It was really annoying. The owners weren't doing much, if anything, to quiet the dog. We called security and when they knocked on the neighbor's door, the dog started barking at the door ferociously. So, much for the ruse of pretending to have a service animal. They were gone within the hour and the next day Marriott did a deep cleaning of their unit. That has got to be an expensive lesson.