When you see a dog wearing blue gear — like a vest, harness, or leash — it often signals that the dog is a service animal or in training

While there isn’t an official universal color code, blue is commonly used for dogs that assist people with disabilities. These dogs are working animals performing critical tasks, so it’s important not to touch, call, or distract them. Interrupting a service dog, even out of kindness, can be dangerous for the person relying on them.

You might also see blue on therapy dogs or dogs still in the process of becoming service animals. However, it’s worth noting that therapy dogs don’t have the same legal access rights as service dogs under the Americans with Disabilities Act. They provide comfort and emotional support but aren’t trained for specific disability-related tasks.

That said, not every blue leash or vest means the dog is working. Sometimes it’s just the owner’s favorite color. The best way to know for sure is to check for visible labels on the vest or observe the dog’s behavior. Many service dogs have clear markings such as “Service Dog – Do Not Distract” or “In Training.”

Different colors can also carry specific meanings. For instance, yellow is often used for dogs that need space. This might mean the dog is nervous, recovering from trauma, or reactive around people or other animals. Giving them distance helps keep everyone safe and shows respect for the handler’s efforts.

Red usually signals “Do Not Pet.” A red leash or vest can mean the dog is on duty, easily distracted, or uncomfortable with strangers. Ignoring this warning can disrupt their focus and interfere with their work.

Green is frequently worn by dogs in training or friendly working dogs who are approachable under certain circumstances. While they may be learning commands or adjusting to public settings, they’re generally calm and sociable when the handler allows interaction.

Understanding what these colors might indicate helps the public respond appropriately to dogs in vests. Respecting these cues ensures the safety, focus, and effectiveness of service, therapy, and emotional support animals while allowing them to perform their roles without unnecessary interruption