I treated the tank with Epsom salt while keeping feedings to a minimum. When I did feed the fish, I de-shelled frozen peas and fed them exclusively until the fish began to return to normal. The recovery took nearly two full weeks, but Big Dog came around. I am grateful to God that he did. He's one of my favorites.
In retrospect I believe this bout of bloat may have been caused by my feeding of crushed snails. I like to smash up ramshorn snails once in awhile and give the fish a treat. They love them. Unfortunately the chunks of crushed snail shell make perfect obstructions to the intestinal tracts of the fish. I begin to believe that several fish I have lost in the past few years (including a beautiful male Copadichromis melas "Midnight Mloto" and a very large and interesting looking female OB peacock) may have died from this condition as a result of my feeding snails. No more escargot for Big Dog and the boys.