If you see a dog wearing blue gear like a vest or leash, it might indicate more than just a style choice. Blue is commonly used to signify a service dog or a dog in training, though there’s no official color standard. These dogs support people with disabilities and should not be distracted while working. Therapy dogs may also wear blue, but unlike service dogs, they don’t have the same public access rights. Similarly, puppies in training might wear blue gear, much like a “student driver” sign, to alert others they’re still learning.

That said, sometimes blue is simply the owner’s favorite color. Even so, being aware of gear colors helps the public better understand and respect working dogs. Other commonly used colors include yellow, which signals a dog needs space; red, often meaning “Do Not Pet” or indicating a working dog; and green, which usually denotes a dog in training or a friendly working dog. So, next time you see a pup sporting blue gear, take a closer look—it might be hard at work helping someone live a more independent life.