The ADA does not require service animals to wear a vest, ID tag, or specific harness. Section 313 Water Service Agreement.313.1 Developments are required to file a "Water Service Agreement" document with the Maricopa County. Locate a variety of frequently used healthcare provider forms and documents to help you provide quality care to valued AZ Blue members. I don't reject service dog vests at all. I'm in the application process for a program dog. 27 votes, 44 comments.