Fighting For Dog Domination - Mr. and Mrs. Robert Benge, 1236 Ellen Dr., are trying to shove a sturdy, little dog that ‘‘eats like a pig” high on the list of America's favorite canine cuties. The fellow whom they champion is the Pug Dog. At the turn of the century he was the darling of dog society. But the past 50 years have seen the Pomeranian and Pekinese pluck him off that perch in the toy dog or 15-puund class. The Pug last year was 28th in line behind the Beagle, America s favorite dog. That, the Benges believe, is too far back...