Do I need to get a special license for my service dog to be registered as a service animal?
No. Under Title II and III of the Americans with Disabilities Act (ADA), covered entities such as businesses or state and local governments may not require any documentation related to a service animal. This includes any sort of proof that the animal has been certified, trained, or licensed as a service animal.
You can purchase service animal certifications or registrations online. However, these documents are neither recognized nor required by the US Department of Justice, the government department that enforces Title II and III of the ADA. Therefore, online registries or licenses have no legal weight in determining the rights of a service dog to enter public places.