Two other points of the ADA:
I doubt the restaurant (or whatever) would be liable for any damage caused by the service animal in the event that it did bite someone...in most situations, they simply don't have the authority to deny service or request the service animal remain outside. Any decent lawyer should be able to make the case that the company simply did not have any choice but to allow the service animal in and therefore can not be held liable for an attack.A person with a disability cannot be asked to remove his service animal from the premises unless: (1) the dog is out of control and the handler does not take effective action to control it or (2) the dog is not housebroken. When there is a legitimate reason to ask that a service animal be removed, staff must offer the person with the disability the opportunity to obtain goods or services without the animal’s presence.
If a business such as a hotel normally charges guests for damage that they cause, a customer with a disability may also be charged for damage caused by himself or his service animal.
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https://www.ada.gov/service_animals_2010.htm
Allergies and fear of dogs are not valid reasons for denying access or refusing service to people using service animals. When a person who is allergic to dog dander and a person who uses a service animal must spend time in the same room or facility, for example, in a school classroom or at a homeless shelter, they both should be accommodated by assigning them, if possible, to different locations within the room or different rooms in the facility.