If you see a pedestrian with a dog wearing a yellow or burgundy coat, it means that the dog is trained to assist a deaf or hard of hearing person. The yellow or burgundy coat signals that the dog is a service animal for someone who is deaf, and as a result, drivers and others should be cautious and prepared to assist if needed because the pedestrian may not be aware of approaching vehicles. This color-coded coat is a way to alert others to take extra care around the pedestrian and dog, acknowledging the special role of the dog in providing assistance to someone with hearing impairment.

Additionally, yellow on dogs in other contexts can sometimes indicate that the dog needs space or is anxious, but in the specific case of a pedestrian's dog with a yellow or burgundy coat, it primarily signifies assistance for the deaf or hard of hearing.