If you see a dog wearing blue gear such as a vest or leash, it could be more than just a fashion choice. Blue is frequently used to indicate that a dog is a service animal or currently in training. While there’s no official color code, this is a widely recognized signal. These dogs support individuals with disabilities and should never be distracted while working.

Therapy dogs may also wear blue, but it’s important to note that they don’t have the same legal public access rights as service dogs. Similarly, young or trainee service dogs might wear blue gear to signal that they are still learning—like a “student driver” sign for humans.

That said, not every dog wearing blue is on official duty. Sometimes, blue is simply the owner’s favorite color. Still, being aware of color cues helps the public treat working dogs with the respect they deserve.

Other vest color signals include yellow, which usually means the dog needs space and should not be approached. Red often indicates “Do Not Pet” or identifies a dog actively working. Green usually denotes a dog in training or a friendly working animal.

Next time you see a dog in blue gear, take a moment to consider its role. It could be hard at work, playing a vital part in someone’s daily life. Recognizing and respecting these signals supports both the dogs and the people who rely on them.