Medical alert service dogs should never be touched or distracted when seen in public with their owners. They are there to help if something goes wrong and need to stay undistracted. So when a little girl asks this woman if she can pet her dog, she is told no but receives a valuable life lesson.
This is the right way to go about the situation, and the explanation is very helpful. As a thank you for asking, the woman then allows the girl to go ahead and pet the dog. Gotta love how this was handled all around! 🙂