This is a great slide show with explanations of an older "helper" dog being used to soothe an anxious young dog. Elliot the helper dog is clearly a very well-balanced empathetic dog well-suited for what he is doing.
From Bad Rap's Facebook page:
Twenty slides showing a greeting ritual between a concerned female dog (Emmalou) and an experienced male (Elliot) who uses eons-old canine body language to communicate: "You are safe."
Link:
Emmalou meets Elliot