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-pound class. The Pug last year was 28th in line behind the Beagle, America s favorite dog. That, the Benges believe, is too far back. Dog books note that the Pug sneaked out of a family set-up that traces back to the ancient Happa dog of China. Dutch sailors are supposed to have picked him up there, carted him to Holland and then dropped a few on the English coast. His trip over the centuries from England to Middletown was not a difficult one...