You are going to be hard put to find a food formulated for puppies with lower protein than the adult formula. If you are willing to consider it, Eukanuba Excel formulas for adults will fit the bill - the chicken formula is 23% protein, and there are others that you can look at (lamb, salmon, etc.). None of these Eukanuba product contain corn or wheat - they are not grain free, however, as they do contain brewer's rice. All of the information is on the Eukanuba website.

we have been feeding 4 Health from Tractor Supply for a few years and like it very much. We have one puppy that needs a low protein diet and their Lamb and Rice is 21 %. I have always weaned our puppies to the food we feed the adults, the Salmon and Potato. I can't remember ever having dogs on anything lower than 26%. I am not sure why the low protein for puppies? We fed Fromm Gold Adult for awhile but couldn't keep weight on the dogs. It is more expensive. I know people like the Kirkland really well, it is probably priced around the same as the 4 Health. $31 for 35#

If I were to go to an inexpensive food nationally available that puppy buyers could get easily, I'd go to Purina One as I trust Purina far more than Diamond, which manufactures Kirkland, 4Health, Canadae, and others, last I checked. The Purina foods are actually used to grow the Purina Farms Labradors, which is good to know if you are presumably feeding Labs. Yet Purina One is usually available to Costco or Sam's club, grocery stores, and even Walmart and Target. For Labradors, I would use the Large Breed Puppy for pups over 4 months, and regular Puppy for in whelp girls and their weanlings. I see that the 31 lb bag is retailing from about $31 to $35. It is 26 percent protein but only 12% fat, with controlled mineral levels. Add a vitamin C supplement or tomato juice, and you may avoid pano, if that is your goal in going to low protein. If that is too pricey, I guess there is Purina Dog Chow, but I don't like the formula changes it has gone through over the years. Purina One is better than having the folks go to Big Red or Ol Roy!

That being said, at least one major guide dog school promotes using Iams, which is also cheap and readily available. I just don't like the recent track record for food safety from Iams/Eukanuba.

The average pet puppy buyer would rather pick up the food where it is convenient and not order off the internet, or you could do the Puppy Gold from Fromms. There are other foods I strongly prefer, but they are less convenient and cost more. In Purina family, I strongly prefer Pro Plan, but that involves at least going to the pet supply store or Tractor Supply. The food seems higher priced at TS.

Personally, I did not like Fromm puppy at all. Pups were not bloomy, lacked bone & coat. Similar lines did much better on ProPlan puppy.

CANIDAE Large Breed Puppy
http://www.canidae.com/dogs/life-stages/dry/large-breed-puppy/duck

Disclaimer: I am employed by CANIDAE. While, this is not my food of choice for my Labrador puppies, it fits your request.

It can be found at most independant retailers and Petco. CANIDAE has a great breeder program.

Or there is always our CANIDAE ALS formulation also found in the same places and I prefer it over the Large Breed Puppy and is a very cost effective choice.
http://www.canidae.com/dogs/life-stages/dry/all-life-stages

I actually feed my puppies CANIDAE Chicken and Rice.

Dog food is an amazing market every dog is different and can do better on one food over another. It is great to have so many choices.

Best of luck on choosing :)

@Julsby, is it true that Canidae is manufactured by Diamond, as suggested by "Shopper"?

Yes, Diamond does co-pack for us to our specified standards. We do also have our own plant where we produce our own foods too.
We are still a small family owned company. I have worked in the home office in sunny California along side the owners for over 6 years. The owners are very passionate about pet food and their dogs are spoiled rotten members of the family. We currently have 3 Labradors, a Jack Russel mix, a Yorkie, and a Chihuahua running around our office today.
For what it is worth and because I know people worry as do I. While I was in the area for my son's Basic Training Graduation from Fort Jackson, I scheduled a tour of the Diamond SC plant. I wanted to ask the plant manager face to face the pressing questions we all wanted to know. What did you learn and how did you improve your plant after the most recent recall? The overal plant was quite impressive. I was very impressed with the many changes they had made in the recent years to improve their product safety. I have toured other Pet Food plants prior to the recalls and it was evedent to me they had taken note and learned from the recall.
I brought my Husband along and he was equally impressed. In fact he stated that dog food is cheap compared to the amount of work it takes to produce one bag. I hushed him right away. LOL.
I did not post this to persuade anyone into buying CANIDAE. I posted to answer the original posters question. There are many great brands of dog food out there and it is awesome that we have so many choices and options available. I just so happen to know personally what goes into every bag of food I feed my dogs and am very please with how well my dogs do on CANIDAE.

Julie :)