Is she was carrying twins each weighing 12-14 pounds she would also have about that much in fluid and other stuff as well. Most pregnant animals I have seen in my life are much more...even in their distribuiton of weight, it would be a more gentle slop off the front of the animal than that and it would be more gentle in back too. It would just be less pronounced... Just doesn't strike me as something that would be caused by pregnancy alone.. There has to be something wrong with the abdominal wall.