A blue vest, bandana, or leash can look official, but blue does not have one universal meaning. Some handlers use it to mark a working dog. Others use it because they like the color. You cannot read a job title off fabric alone. What you can do is treat an unfamiliar dog as if it might be busy, and wait for the person holding the leash to decide whether contact is welcome.
Service dogs are trained to help a specific person with a disability. They may guide someone with limited vision, brace a handler who needs mobility support, or alert to a medical change. When that work is happening, blue gear is sometimes a quiet sign that the dog should not be called, fed, or petted. A moment of attention from a stranger can break a task the handler depends on.
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