What question can you ask a passenger with a dog that is not in a carrier?

Asking whether the dog is a service animal is the appropriate question to ensure compliance with regulations regarding animals on public transportation. Service animals, as defined under the Americans with Disabilities Act (ADA), are specifically trained to assist individuals with disabilities. By inquiring if the dog is a service animal, you can determine its role and whether it has the rights that accompany being a service animal.

This question serves a dual purpose: it allows you to ascertain the dog's status while also respecting the rights of individuals who may rely on such animals for assistance. It is essential to act professionally and respect the privacy of the passenger, which is why this question focuses on the function of the dog rather than making assumptions about its nature or behavior, as would be the case with other potential questions.