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I have to ask - Why are you feeding so much?
I'm not criticizing, just asking...it seems like an astounding amount of food for a 50 pound dog, even a puppy. At 5 months, his growth is slowing down, and I just can't believe he needs that much, especially puppy chow. My 120 pound Newfs don't eat five cups of food a day - and they never get puppy chow, ever - it's not necessary, it just makes them grow faster, not better or anything.
My 50 lb Australian Shepherd gets two cups adult dog food a day, and he goes hiking, does obedience, herding, agility, and every day he gets a mile long walk off leash through the woods ... and the vet is ecstatic at the great shape he's in. In fact, my older, 65 lb Aussie also gets 2 cups a day, but he's lots less active so even though he's bigger, he doesn't burn it off like the younger one does.
That being said, I do realize every dog is different. Out of my five, my aussies will eat anything, any time, as much as possible. One Newf is always happy to eat. ONe Newf is like your dog, she can take it or leave it, and the third Newf is in the middle, she's always ready for her meals, but not so food oriented in between. I would think that food just isn't that important to your dog - and he gets so much of it that he's probably not all that hungry. I have a friend with a 55 lb pit bull who has dry food down all the time (which is not usually a good idea), because the only way she eats enough is to be able to nibble all the time. It's just her nature. If your dog is healthy, don't worry too much about his lack of enthusiasm for food. It is possible, as some one suggested, that he doesn't much care for his food. I'm sure you know that if you switch, you would put 1/4 of new food with 3/4 of the current kind, for a couple of days, then go to half and half, then to 3/4 new with 1/4 current, then all the way to the new.
I have used Purina One for years, as has a friend of mine who generally has 15 - 20 Newfs in her kennel, including older dogs, actively showing/working dogs, and puppies in all stages of growth. The dogs seem to do well on it. My dogs' herding instructor used Blue Seal veal and rice, and loves how her border collies are doing on that. Either which way, you could switch him to adult food any time now.
Good luck with your boy, and don't worry as long as he's healthy.