Therapy dogs, unfortunately, do not qualify as service dogs, but if you have a disability that you can train your dog to assist you with then they can become a servixe dog and be allowed access anywhere under the Americans with Disabilities Act. It is a federal law and therefore takes precedence over all local and state laws.
Go to
www.usdoj.gov/crt/ada/qasrvc.htm - 9k Questions About Service Animals in Places of Business
and you will get lots of info on the law.