Guide dogs provide opportunities for social interaction and greater independence for legally blind adults. International Guide Dog Day pays tribute to the dogs who do this impressive work. Guide dogs help the visually impaired make their way through the world while offering love and comfort in so many ways. Here are some guide dog etiquette tips: Harness on means hands off. A guide dog in harness means “I’m working.” Petting can take the guide dog’s focus off its partner and increases the potential for injury. When in doubt, ask the dog's handler. References to guide dogs date back to at least the 16th century, so for the hundreds of years of service that these faithful companions have provided, we say thank you on April 24 (the last Wednesday in April). Guide Dogs of America, founded over 70 years ago, sponsors this event.