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Diamond Maintenance package official product image via Amazon

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Diamond Maintenance

Dry food · adult dogs

A formulated-to-meet, chicken-first dry food that's denser than 23% (you feed fewer cups). We don't have a cost per day for this food yet.

THE FACTS, ONE SENTENCE — data as JSON · reference dog 40 lb · updated 2026-10-18

$27.99 · 20 lb as of 2026-10-18 Check price →
Tell us about your dogevery number on this page updates live ↓
40 lb
For a 40-lb adult: 2¾ cupsper day not pricedper day —bag lasts passes 2 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 2026-10-18

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 24.4%label: 22% min lower than 90% of dry foods
Fat 13.3%label: 12% min lower than 82% of dry foods
Fiber 4.4%label: 4% max lower than 69% of dry foods
Est. carbohydrates ash not disclosed → 8% assumed, so this is an estimate ≈48.9%computed anchor available once more brands disclose ash
Calcium / Phosphorus extended guarantees: Ca 1% · P 0.8% · Ω-3 0.3% 1.25 : 1ratio, as fed within the AAFCO adult range (1:1 – 2:1)

Calories & cost — for your 40-lb adult dog

Calorie density 351 kcal/cup— kcal/kg lighter than 77% of dry foods (median 388) — you feed more cups
Daily serving2¾ cups
Cost per day—
20-lb bag lasts—

No cost per 1,000 kcal: the label we read gives no calorie count, so we can't work out the price per calorie. 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 · maintenance
First five ingredients (by pre-cooking weight)Chicken by-product meal (a source of glucosamine) · wheat flour · whole grain ground corn · rice bran · grain sorghum
Named animal protein first; named meals onlyYes
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, 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, 2026-10-18 · 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.
✓
Passes our sensitive-stomach checksNamed animal protein first, and no unnamed by-products in the ingredient list.
·
Contains chickenNot selected as a concern for your dog — shown here for reference.

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 →

Chicken by-product meal (a source of glucosamine), wheat flour, whole grain ground corn, rice bran, grain sorghum, dried plain beet pulp, chicken fat (preserved with mixed tocopherols), egg product, dried yeast, natural flavor, flaxseed, calcium carbonate, potassium chloride, salt, DL-Methionine, choline chloride, dried Lactobacillus plantarum fermentation product, dried Bacillus subtilis fermentation product, dried Lactobacillus acidophilus fermentation product, dried Enterococcus faecium fermentation product, dried Bifidobacterium animalis fermentation product, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, manganese sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, vitamin A supplement, biotin, niacin, calcium pantothenate, sodium selenite, pyridoxine hydrochloride, vitamin B12 supplement, riboflavin, vitamin D3 supplement, folic acid

5 ingredients in this list are ones we hold sourced evidence on , and none of them is contested in the veterinary literature.

  • Beet Pulp · ingredient 6Well supportedThe fibrous material left after sugar is extracted from sugar beets, included as a moderately fermentable fiber source (commonly around 5 to 7.5% of the diet). Controlled feeding studies show it supports firm, good-quality stools and short-chain fatty acid production without impairing overall nutrient digestibility, so the 'cheap filler' characterization is not supported by the evidence.
  • Mixed tocopherols (natural vitamin E) · ingredient 7Well supportedA blend of vitamin E forms (alpha-, beta-, gamma-, delta-tocopherol) used as a natural-source antioxidant to slow fat rancidity, commonly chosen as an alternative to synthetic preservatives. EFSA concluded that tocopherol-rich extracts are safe for all animal species and the consumer and are efficacious antioxidants in feed.
  • By-Product Meal (Meat / Poultry By-Product Meal) · ingredient 1NeutralA rendered concentrate made from clean, non-muscle parts of the carcass (organs, necks, feet, and similar), defined by AAFCO. It is more variable and lower-transparency than a named muscle meal, but it is not inherently unsafe or low-nutrition: controlled feeding trials in dogs report high protein digestibility (roughly 92-95%) for poultry by-product-based diets, and some by-product organs are nutrient-dense.
  • Flaxseed (ALA omega-3) · ingredient 11NeutralA plant source of the short-chain omega-3 ALA. Dogs convert ALA to the long-chain omega-3s inefficiently: a controlled feeding study (Dunbar 2010) found flaxseed raised serum EPA but produced no measurable DHA.
  • Probiotics (live microbials) · ingredient 17NeutralLive microbial supplements (e.g., Enterococcus faecium SF68, dried fermentation products) intended to support gut health. A 2019 JVIM systematic review found the effect on acute gastrointestinal disease in dogs limited and possibly clinically unimportant, and benefits appear strain- and context-specific: in one shelter trial SF68 significantly reduced diarrhea in cats but not in dogs.

Nutritional twins

Priced close matches

This food has no verified price yet — these are the closest label matches that do.

Nutro Large Breed Adult Lamb & Brown Rice Recipe
24.4% protein (DM)$1.65 / 1,000 kcal
Royal Canin Bulldog Adult Dry Dog Food
24.4% protein (DM)$2.05 / 1,000 kcal
Wellness Whitefish & Sweet Potato
24.4% protein (DM)$1.47 / 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

Facilities are described as Diamond's own in Meta, Missouri (HQ); Gaston, South Carolina; Lathrop, California; Ripon, California; Dumas, Arkansas; Frontenac, Kansas; and Rushville, Indiana. Diamond Pet Foods is well known industry-wide as a company that owns and operates its own plants rather than co-packing.

source →
Employs a qualified nutritionist Undisclosed

Diamond states it uses an internal team spanning veterinary medicine and companion-animal nutrition disciplines, but does not name a specific individual or state a board certification for any staff member on this or other pages found.

source →
AAFCO feeding trials Undisclosed

No feeding-trial AAFCO statement found on the 7 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. (privately held, family-owned; Diamond Pet Foods is the trade name) ↗ Founded 1970 ↗ Headquarters / plant Meta, Missouri, USA ↗ FDA recalls on record 7 on record

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