It would be more than useful. I realize that the plural of anecdote is not data but there's a difference between statistical significance and clinical significance. In the clinical significance, in every pairing of a service dog with a veteran that I have been involved with, there has been improved social functioning, a decrease in medication, improvement in the quality of their primary relationships with their family, and reintegration into society. As a rehabilitation outcome, that can only be deemed successful and something that should be pursued.
On March 4th, 2014. See this statement in context.