Very few people know that Buster was actually tested and certified as a therapy dog before Peaches, and six months younger in age.  But the reason that Peaches has been working steadily as a therapy dog for the last year and that Buster has not is simply a matter of mode and preference.  Buster, despite being far superior to Peaches in obedience and skill performance, has only two modes of operation when it comes to interacting with people:  indifferent or smothering.

Here is an example of smothering, with his daddy.