However, not all dogs in blue are working or training. Some pet owners simply like the color, and their dog may just be out for a walk. Always look for labels like “Service Dog” or “Do Not Pet” to be sure. It’s best to observe before approaching any dog wearing gear.

Other colors can carry meaning too yellow means the dog needs space, red may signal “Do Not Pet,” and green can show they’re friendly or learning. Knowing these cues helps people interact respectfully with dogs and their handlers. So the next time you see a dog in blue, remember: it may be doing something very important.