4.6(6,700)Amazon rating$43.992,000+ bought last month
Our verdict
Diamond Puppy 31/20 is an all-natural, high protein formula built for growing puppies and for pregnant or nursing adult dogs, packed with DHA and antioxidants to support development, and it holds a solid 4.6 stars across 6,749 reviews.
Growing puppies of large breeds, plus pregnant or nursing adult dogs that need extra nutritional support.
Skip if
You have a small breed puppy, since this bag is sized and formulated with large breed puppies in mind.
Form Pellet
Flavor Puppy
Benefits Supports Puppy Growth, Brain Development, And Immune Health; Suitable For Pregnant/Nursing Dogs
Best for Coat
Breed size Large
Weight 40 Pounds
Priced 18% above the category median ($37.22 across 146 tracked models)
Our scorecard
4.6/5overall
Owner rating4.6/5
4.6 average across 6,700 owner ratings
Popularity3.5/5
6,700 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other dog food and health supplements we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The '31/20' in the name points to the formula's protein and fat targets, and this bag is built for puppies as well as pregnant and nursing adult dogs, a life stage overlap that not every puppy food covers. Diamond says the recipe was developed with veterinarians and a pet nutritionist, and it is enhanced with DHA, omega fatty acids, and antioxidants to support brain and vision development along with steady growth.
The formula is labeled all-natural and allergen-free, comes in a Small Bites kibble size suited to large breed puppies, and ships in a 40 lb bag for $43.99, a reasonable per-pound price for a puppy-specific formula. At 4.6 stars across 6,749 reviews and about 2,000 bags bought in the last month, it has a solid, established track record.
Pros
Covers both growing puppies and pregnant or nursing adult dogs in one formula
DHA, omega fatty acids, and antioxidants included to support brain and vision development
All-natural and allergen-free labeling
Large 40 lb bag keeps the per-pound cost reasonable for a puppy formula
Strong track record with 6,749 reviews at 4.6 stars
Cons
Sized and formulated for large breeds, so it is not the right fit for small or toy breed puppies
40 lbs is a big bag if you only have one puppy or a small litter, so keep an eye on the best by date
Specifications
Form
Pellet
Flavor
Puppy
Benefits
Supports Puppy Growth, Brain Development, And Immune Health; Suitable For Pregnant/Nursing Dogs
Best for
Coat
Breed size
Large
Weight
40 Pounds
Performance notes
Item form is a pellet style kibble in a Small Bites cut, which is easier for young puppies to chew than standard sized kibble. The Product Benefits listing calls out support for puppy growth, brain development, and immune health, and the formula is also positioned as suitable for pregnant or nursing adult dogs, which lines up with the added DHA and omega fatty acids in the recipe.
What buyers say
At 4.6 stars across 6,749 reviews, this formula has a large and consistently positive review base for a puppy-specific food. About 2,000 bags were purchased in the last month, indicating steady, ongoing demand rather than a one-time spike.
Yes, Diamond formulates this recipe to work for both growing puppies and pregnant or nursing adult dogs, since both groups have elevated nutritional needs. If your dog is pregnant or nursing, it is still worth checking feeding amounts with your vet since needs can vary a lot by breed and litter size.
Is this formula grain-free?
Diamond does not label this specific formula as grain-free, listing Special Ingredients simply as all-natural. If your puppy needs a grain-free diet for a specific reason, check the ingredient list on the bag or ask your vet before switching.
What does the 31/20 in the name mean?
It refers to the formula's protein and fat targets, a naming convention Diamond uses across several of its puppy and performance lines. Combined with the DHA and antioxidants in the recipe, it is meant to support steady growth and development in puppies.
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