What exactly are the rules?
There is no registration for service animals.
Remember, the service animal has to be under the control of the owner. You should ask the handler to ensure that the animal is under control. If the handler cannot control the animal, you can ask that they remove it.
The business has no obligation to provide for the service animal’s needs. Ultimately though, this could be seen as good customer service.
The handler must be in control of the animal. A staff member should politely ask the handler to control the dog. If the owner doesn’t start controlling the dog, the staff member can ask the owner to take the dog out. The handler should be allowed to re-enter the library without the dog.