There are major flaws and minor flaws in show dogs. I have never shown Newfies but I have shown Pyrs. I do know that size is a serious fault in showing Pyrs. Im not sure on the Newfie but I suspect it is. I took a look at the standard for Newfs and it does not appear that size is a disqualificati on. But on any given day your dog may be the best in the ring and loose mearly on size. You can beat your head against the wall, spend a fortune and hours researching judges and you might get by with it, you might not. The question is, if you want to show, why not get a dog that does not have those types of flaws. He may be a doll and have the perfect personality for showing but with this type of flaw, I would not show nor would I breed him. That's not critisim, just advise. I sold a show pup to a gal in Canada. You might know, she did not reach standard size.. dang, dang, dang... so I know how you feel.
Jackie