Service dogs aren't dogs, they are medical devices. A car used in ride share isn't a private space any longer, it's quasi-public. The law (at least in the USA)

Service dogs aren't dogs, they are medical devices. A car used in ride share isn't a private space any longer, it's quasi-public. The law (at least in the USA) is very clear, you can not restrict access of medical devices (whether service dogs or wheelchairs) in businesses.