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Diamond Naturals Grain-Free Pasture-Raised Beef & Sweet Potato Formula for Dogs package official product image via Amazon

Diamond Naturals · brand facts & recall history →

Diamond Naturals Grain-Free Pasture-Raised Beef & Sweet Potato Formula for Dogs

Dry food · all dogs

A formulated-to-meet dry food that's cheaper per calorie than 88% of the dry foods we've priced and denser than 68% (you feed fewer cups) — $1.13 a day for your 40-lb adult dog.

THE FACTS, ONE SENTENCE — data as JSON · reference dog 40 lb · updated 2026-10-19

$51.99 · 28 lb $1.13/day as of 2026-10-19 Check price →
Tell us about your dogevery number on this page updates live ↓
40 lb
For a 40-lb adult: 2½ cupsper day $1.13per day 46 daysbag lasts 1 pass, 1 fail fit checks ↓

Joint, kidney, dental or heart concerns? Labels can't honestly answer those — that's vet territory. Why we don't checkmark them →

The evidence

The Verified Label

Every food on this site gets this exact panel — same fields, same order, sourced from the official label — so brands finally become comparable. Dots show where this food sits among all 494 dry foods we've verified.

Verified LabelThe standardized pet-food panel
VPFD № DIAMON
verified 2026-10-19

Composition — dry-matter basis

why dry matter
Kibble is ~10% water, canned food ~78%, so as-fed numbers are on two different scales. As-fed values shown small. How the conversion works →
Protein 26.7%label: 24% min lower than 77% of dry foods
Fat 15.6%label: 14% min typical — the median dry food is 16.7%
Fiber 5.6%label: 5% max typical — the median dry food is 5.4%
Est. carbohydrates ash not disclosed → 8% assumed, so this is an estimate ≈43.3%computed anchor available once more brands disclose ash
Calcium / Phosphorus extended guarantees: DHA 0.05% · Ω-3 0.3% Not yet verifiedcalcium/phosphorus no ratio to anchor

Calories & cost — for your 40-lb adult dog

Calorie density 406 kcal/cup3580 kcal/kg denser than 68% of dry foods (median 388) — you feed fewer cups
Daily serving2½ cups
Cost per day$1.13
28-lb bag lasts46 days

Cost per 1,000 kcal: $1.14 — cheaper than 88% of the 360 dry foods we've priced (median $1.93). Serving math uses standard veterinary energy formulas — see the formula.

Standards & ingredients

AAFCO statement
what this means
Two claims exist: formulated to meet a profile, or fed to real dogs in an AAFCO trial. Which is stronger, and how rare it is →
 Formulated to meet · all_life_stages
First five ingredients (by pre-cooking weight)Contains a source of live (viable) · naturally occurring microorganisms
Named animal protein first; named meals onlyNo
Legumes in first 10 (FDA DCM inquiry)None
BHA / BHT preservativesNone on label
Carrageenan (thickener)None
Ethoxyquin
why unknown
A preservative added by a fish-meal supplier need not appear on the finished label, so no label can prove its absence. Why we show gaps →
 None — no fish meal in this recipe

Safety

FDA recalls — Diamond Naturals, since 2023None on record
ManufacturerNot confirmed from label
Label transparency 10 of 15 standard fields
Green = verified favorable · amber = gap in the record · red = verified unfavorable · gray = not disclosed / neutral fact.
Source: official label source (official)· price: Amazon, 2026-10-19 · anchors: 494 verified dry dog foods (360 priced) · how to read this label

The fit

For your dog, specifically

Checked for a 40-lb adult with a sensitive stomach — the same published criteria our finder uses. Change your dog above and these update.

✓
Validated for adult dogsAAFCO statement covers adult maintenance.
✕
Does not pass our sensitive-stomach checksDoes not lead with a named animal protein. See sensitive-stomach qualifiers →
·
Chicken-free recipeNot selected for your dog — but relevant if chicken sensitivity ever comes up.

The source material

The full ingredient list

Every flag above is computed from this list. Why order is by pre-cooking weight, and how splitting bends it →

Contains a source of live (viable), naturally occurring microorganisms

Nutritional twins

Cheaper close matches

Verified foods with a closely matching label at a meaningfully lower cost per 1,000 kcal.

IAMS™ MINICHUNKS LAMB & RICE
27.8% protein (DM)$0.91 / 1,000 kcal21% less per 1,000 kcal
Rachael Ray Nutrish Real Chicken & Veggies Recipe Dry Dog Food
25.6% protein (DM)$0.85 / 1,000 kcal26% less per 1,000 kcal
Purina ONE Chicken & Rice Formula Dry Dog Food
29.5% protein (DM)$0.86 / 1,000 kcal25% less per 1,000 kcal

Label-composition matches only: same species, form, and growth stage; same primary protein where both are known; grain-free preserved; protein within 4 points and fat within 4 points, and estimated carbs within 8 points, on a dry-matter basis. Not a medical or quality recommendation.

The maker

Who makes this — and how they back it up

The five questions the WSAVA nutrition guidelines tell you to ask a pet-food company. Every answer is sourced or marked as an undisclosed gap — never guessed. This is the "is it made competently?" axis that star-rating sites skip.

Owns its manufacturing Owns its plants

Diamond Pet Foods owns and operates its own U.S. plants (Meta MO; Lathrop CA 1999; Gaston SC 2003; Ripon CA 2012; Dumas AR 2016; Frontenac KS 2021), where Diamond Naturals is produced.

source →
Employs a qualified nutritionist Undisclosed

The source refers to disciplines/experts (veterinary medicine, companion animal nutrition) but does NOT name any specific board-certified veterinary nutritionist (ACVN/ECVCN Diplomate) or PhD nutritionist on staff.

source →
AAFCO feeding trials Undisclosed

No feeding-trial AAFCO statement found on the 25 labels we’ve verified for this brand, and no company-wide claim was found either. Most pet foods are only "formulated to meet" AAFCO profiles (a paper calculation) rather than fed to real animals in trials — this is common, not necessarily a red flag.

Publishes quality-control testing Yes — sourced

covers: ingredient toxin testing; same page: 1,538 microbiological tests/week, test-and-hold of finished product by a certified lab, oxidative stability tests. Diamond Pet Foods page covering its own brands.

source →
Peer-reviewed research None found

PubMed lists no animal or pet paper with Diamond Pet Foods in an author address. Not proof no research exists — only that none is indexed under that company name.

source →
Parent company Schell & Kampeter, Inc. (Diamond Pet Foods) ↗ Headquarters / plant Meta, Missouri, USA ↗ FDA recalls on record 1 on record

Full company scorecard, sources, and every SKU we've verified for this brand: Diamond Naturals brand page →