Organizing a fear hierarchy exercise

Cassandra is afraid of dogs. She refuses to walk around the neighborhood
without her husband for fear of being attacked by a dog. She tends to avoid
places where there are dogs, such as parks or hiking trails (even though she
used to enjoy hiking). She will cross the street if she sees someone walking with
a dog and will refuse to enter a store if a dog is tied up out front.

Help her organize a fear hierarchy, with 1 representing the least anxiety provoking situation.