Regularly give that 125 pound dog a good bath and make extra effort to clean the folds of her jowls for dirt, food and spit and the dog will smell just fine.  Also a better diet would help to reduce the smells coming out at both ends.  Cheap wet dog food is nasty, greasy and smelly while the better wet and dry dog foods are not as foul smelling even after getting po oped out by the dog   Of course the better dog foods are expensive and for a 125 pound mastiff costs adds up fast.  Maybe the owner of the 'world's ugliest dog' can get sponsored by one of the better dog food companies