Service dog ID badges
Americans with Disabilities Act (ADA) recognizes service animals as lawful companion to disabled people and therefore requires access to be granted to all public facilities as well as private businesses providing services to the public. Service animal is not a pet and misrepresentation in this area is against the law. While service dogs ID badges are not required many people find them handy not only to identify the dogs but also remind the status of the law in confrontational situations.
For more information about service dogs regulations please visit the US Department of Justice FAQ section using the link below https://www.ada.gov/regs2010/service_animal_qa.html