Have you ever seen dogs wearing red vests in the library or another public space? Those red vests denote a trained service animal, or one that is in training.The Red Vest designation recognizes places that are welcoming and accessible to people with disabilities and are committed to public access rights. Pick-up, dog licensing, sign permits, facility rentals, or emergency services. Virginia Master Naturalists are volunteer educators, citizen scientists, and stewards helping Virginia conserve and manage natural resources and public lands. All dogs 4 months of age and older must be licensed with Fairfax County and must be licensed annually. View the complete Fairfax County ordinance.