Unfortunately, Trusty decided that with Paul gone he was now alpha in the family pack. He ignored me completely and instead challenged Howard, who was then just fourteen. The dog would come up to where Howard was sitting and growl in his face. Given that the dog outweighed Howard by probably twenty pounds and had much bigger teeth, this was pretty scary.
We turned to a dog psychologist who said that we had obviously neglected this dog's training. He told us that we would have to use extreme measures in this situation. He recommended we get a canned-air boat horn and honk it whenever Trusty showed aggression. This is a very loud product, intended for signaling boats in fog, but since dogs have sensitive hearing he thought it would stop the aggression. The psychologist warned that the dog should not see the boat horn; the sound should appear to the dog to be an act of God.
I bought the boat horn, and the next time Trusty showed aggression towards Howard I held the horn behind my back and honked it. Trusty immediately backed away from Howard. However, there was another dog in the family--a very smart and protective Australian Shepherd named Blue. Blue saw the boat horn and decided that it must be attacking me. He, in turn, went after the boat horn and accidentally bit me in the rear. By this time the boat horn had frozen in the "on" position and would not stop honking. Blue kept attacking the boat horn (read "my behind") until I could get to a door and throw the horn into the yard. I was laughing so hard that I couldn't do anything else to reassure Blue. He didn't injure me, but we decided that boat horn training wasn't going to work for our family.
Note from Paul: Now we need to start looking for Trusty IV.