Is Diamond Pet Foods Maintenance Formula a good dog food?
We score it 48/100 (Average). This reflects the ingredient quality, composition and label transparency of the recipe as declared on the label.
Why this score?
This recipe achieves an overall rating of 48 out of 100. The inclusion of ingredients without printed percentages contributed -10.6 points, and the processing format adjusted the score by -6.7. Conversely, the overall quality of the ingredient list added +5.6 points, while being labelled nutritionally complete contributed +2.3 points to the final evaluation.
Only part of the analytical constituents are declared, so the nutritional picture is incomplete.
100% of this recipe has no printed percentage. Estimated shares are model estimates, not label facts.
- Recipe48
- Nutritionallow94
- Transparency55
- Safety100
- EvidenceNot recorded
The Recipe score measures how attractive and transparent the declared ingredient list is. It is not, by itself, proof that the food is nutritionally appropriate for long-term feeding. The Nutritional and Evidence scores measure what we can verify towards that stronger claim.
Why you might choose it
- Single named animal protein: chicken.
- Declares energy content, which most labels omit.
- Nutritionally complete: formulated to be fed as the whole diet.
Why you might not
- Meat makes up an estimated 4% of the dry matter (6% as fed); carbohydrates dominate.
- 100% of the recipe mass has no printed percentage, so the exact split cannot be verified.
Estimated composition
Typical analysis (as fed)
- Protein
- 22%
- Fat
- 12%
- Fibre
- 4%
- Moisture
- 10%
- Omega-3 fatty acids
- 0.30%
- Omega-6 fatty acids
- 2.20%
- Calcium
- 1%
- Phosphorus
- 0.80%
Energy: 344 kcal/100g
Additives & feeding info
Nutritional additives
Vitamin E supplement 150 IU/kg min; Iron proteinate; Zinc proteinate 180 mg/kg min; Copper proteinate; Ferrous sulfate; Zinc sulfate; Manganese sulfate; Manganese proteinate; Copper sulfate; Potassium iodide; Sodium selenite 0.5 mg/kg min; Thiamine mononitrate; Vitamin A supplement 10,000 IU/kg min; Biotin; Niacin; Calcium pantothenate; Pyridoxine hydrochloride; Vitamin B12 supplement; Riboflavin; Vitamin D3 supplement; Folic acid; DL-Methionine 0.6% min; Choline chloride
Technological additives
Mixed tocopherols (preservative for chicken fat)
Feeding guide
3 lb: 1/3 cup; 5 lb: 1/2 cup; 10 lb: 1 cup; 20 lb: 1 2/3 cups; 30 lb: 2 1/4 cups; 40 lb: 2 3/4 cups; 60 lb: 3 3/4 cups; 80 lb: 4 2/3 cups; 100 lb: 5 1/2 cups. For adult dogs over 100 pounds, add approximately 1/3 cup for every 10 additional pounds.
Reviews
Trustpilot: 0.0/5 · 0 reviews
Who is this food for?
Suits
- Labelled by the manufacturer for adult dogs
- Single named protein: chicken
- Doesn't list beef, turkey, lamb, fish, venison, pork, duck as ingredients
Consider something else if:
- Your dog avoids grain: the label lists wheat
These points are derived from declared ingredients and analysis, not a substitute for veterinary advice. If your dog has a diagnosed condition, food choice is a medical nutrition decision: speak to your vet. Use the homepage filter to find foods that fit your dog.
Ingredients (42)
| # | As declared | Matched | Category | Tier | Declared % | Est. % |
|---|---|---|---|---|---|---|
| 1 | Chicken by-product meal (a source of glucosamine) | Chicken | meat | medium | - | 3.1 |
| 2 | wheat flour | Wheat | carb | poor | - | 3.1 |
| 3 | whole grain ground corn | Whole Grains | carb | good | - | 3.1 |
| 4 | rice bran | Rice bran | fibre | good | - | 3.0 |
| 5 | grain sorghum | Sorghum | carb | medium | - | 3.0 |
| 6 | dried plain beet pulp | Beet Pulp | fibre | medium | - | 3.0 |
| 7 | chicken fat (preserved with mixed tocopherols) | Chicken Oil and Fat | oil | medium | - | 2.9 |
| 8 | egg product | Egg | meat | good | - | 2.9 |
| 9 | dried yeast | Yeast | supplement | good | - | 2.8 |
| 10 | natural flavor | Flavor | additive | poor | - | 2.8 |
| 11 | flaxseed | Linseed | veg | good | - | 2.8 |
| 12 | calcium carbonate | Calcium Carbonate | supplement | medium | - | 2.7 |
| 13 | potassium chloride | Potassium Chloride | supplement | medium | - | 2.7 |
| 14 | salt | Salt | additive | medium | - | 2.7 |
| 15 | DL-Methionine | Methionine | supplement | good | - | 2.6 |
| 16 | choline chloride | Choline | supplement | good | - | 2.6 |
| 17 | dried Lactobacillus plantarum fermentation product | Lactobacillus plantarum | supplement | good | - | 2.5 |
| 18 | dried Bacillus subtilis fermentation product | Bacillus Subtilis | supplement | good | - | 2.5 |
| 19 | dried Lactobacillus acidophilus fermentation product | Dried Lactobacillus acidophilus Fermentation Product | supplement | good | - | 2.5 |
| 20 | dried Enterococcus faecium fermentation product | Enterococcus Faecium | supplement | good | - | 2.4 |
| 21 | dried Bifidobacterium animalis fermentation product | unmatched | - | - | - | 2.4 |
| 22 | vitamin E supplement | Vitamin E | supplement | good | - | 2.4 |
| 23 | iron proteinate | Iron Proteinate | mineral | good | - | 2.3 |
| 24 | zinc proteinate | Zinc Proteinate | supplement | good | - | 2.3 |
| 25 | copper proteinate | Copper proteinate | supplement | good | - | 2.2 |
| 26 | ferrous sulfate | Iron sulfate | supplement | good | - | 2.2 |
| 27 | zinc sulfate | Zinc sulfate | supplement | medium | - | 2.2 |
| 28 | manganese sulfate | Manganese sulfate | supplement | medium | - | 2.1 |
| 29 | copper sulfate | Copper sulphate | supplement | good | - | 2.1 |
| 30 | potassium iodide | Potassium iodide | supplement | good | - | 2.1 |
| 31 | thiamine mononitrate | Thiamine mononitrate | supplement | good | - | 2.0 |
| 32 | manganese proteinate | Manganese proteinate | supplement | good | - | 2.0 |
| 33 | vitamin A supplement | Vitamin A | supplement | good | - | 1.9 |
| 34 | biotin | Biotin | supplement | good | - | 1.9 |
| 35 | niacin | Niacin | supplement | good | - | 1.9 |
| 36 | calcium pantothenate | Calcium pantothenate | supplement | good | - | 1.8 |
| 37 | sodium selenite | Sodium selenite | supplement | poor | - | 1.8 |
| 38 | pyridoxine hydrochloride | Pyridoxine hydrochloride | supplement | good | - | 1.8 |
| 39 | vitamin B12 supplement | Vitamin B12 | supplement | good | - | 1.7 |
| 40 | riboflavin | Riboflavin | supplement | good | - | 1.7 |
| 41 | vitamin D3 supplement | Vitamin D3 supplement | supplement | good | - | 1.6 |
| 42 | folic acid | Folic acid | supplement | good | - | 1.6 |
Brand
- Website
- https://www.diamondpet.com/
- Phone
- 866-214-6945
- Contact page
- www.diamondpet.com
Trust and provenance
- Recall history
- No recalls recorded in our database
- Label data last checked
- 2026-09-12
- Scored with
- Model v3 (methodology)
- Product page
- www.diamondpet.com
Recall history is presentation-only and never affects the score. Dates are when we recorded the data, not when the manufacturer last changed the recipe.
Spotted a mistake in this listing? Report it here and we'll take a look.
Recipe: how the 1-100 score is calculated
Scored with model v3 on 2026-09-26. Each component is the feature value for this product multiplied by the model's published coefficient.
| Component | Input | Coefficient | Contribution |
|---|---|---|---|
| Base score | - | 30.909 | +30.91 |
| Average ingredient quality | 0.6 | 9.191 | +5.56 |
| Carb share of dry matter | 8.9% | -0.115 | -1.02 |
| Oil share of dry matter | 3.2% | -0.092 | -0.29 |
| Vegetable share of dry matter | 2.7% | -0.005 | -0.01 |
| Additive share of dry matter | 5.4% | 0.163 | +0.88 |
| Supplement share of dry matter | 64.3% | -0.012 | -0.78 |
| Unrecognised share of dry matter | 3.1% | -0.027 | -0.08 |
| Recipe graded poor | 7.5% | -0.065 | -0.48 |
| Number of poor ingredients | 3 | -0.876 | -2.63 |
| Largest single poor ingredient | 3.0% | 0.060 | +0.18 |
| Undeclared quantities | 100.0% | -0.106 | -10.56 |
| Complete diet | yes | 2.294 | +2.29 |
| Low meat (under 10% of dry matter) | yes | -3.158 | -3.16 |
| Additive penalty | -6.37 | 0.222 | -1.41 |
| Processing multiplier | 0.98 | 33.786 | +33.11 |
| Processing: Dry Extruded | yes | -6.713 | -6.71 |
Show all 40 components
| Component | Input | Coefficient | Contribution |
|---|---|---|---|
| Base score | - | 30.909 | +30.91 |
| Average ingredient quality | 0.6 | 9.191 | +5.56 |
| Meat share of dry matter | 0.0% | 0.096 | +0.00 |
| Carb share of dry matter | 8.9% | -0.115 | -1.02 |
| Oil share of dry matter | 3.2% | -0.092 | -0.29 |
| Vegetable share of dry matter | 2.7% | -0.005 | -0.01 |
| Additive share of dry matter | 5.4% | 0.163 | +0.88 |
| Supplement share of dry matter | 64.3% | -0.012 | -0.78 |
| Other share of dry matter | 0.0% | -0.375 | +0.00 |
| Unrecognised share of dry matter | 3.1% | -0.027 | -0.08 |
| Recipe graded poor | 7.5% | -0.065 | -0.48 |
| Poor-quality meat in recipe | 0.0% | -0.179 | +0.00 |
| Number of poor ingredients | 3 | -0.876 | -2.63 |
| Largest single poor ingredient | 3.0% | 0.060 | +0.18 |
| Undeclared quantities | 100.0% | -0.106 | -10.56 |
| Prints ingredient percentages | no | 0.000 | +0.00 |
| Complete diet | yes | 2.294 | +2.29 |
| Frozen or chilled fresh | no | 0.000 | +0.00 |
| High meat (30%+ of dry matter) | no | 0.707 | +0.00 |
| Low meat (under 10% of dry matter) | yes | -3.158 | -3.16 |
| High carb and low meat | no | -1.180 | +0.00 |
| Meat share × printed percentages | 0.0 | 0.000 | +0.00 |
| Meat share × fresh | 0.0 | 0.000 | +0.00 |
| Fresh × high meat | 0.0 | 11.084 | +0.00 |
| Additive penalty | -6.37 | 0.222 | -1.41 |
| Processing multiplier | 0.98 | 33.786 | +33.11 |
| Processing: Raw | no | -0.054 | +0.00 |
| Processing: Fresh Chilled | no | -2.354 | +0.00 |
| Processing: Fresh Frozen | no | -2.354 | +0.00 |
| Processing: Fresh Refrigerated | no | 0.000 | +0.00 |
| Processing: Fresh Shelf | no | -0.672 | +0.00 |
| Processing: Dry Freeze Dried | no | 6.629 | +0.00 |
| Processing: Dry Air Dried | no | 6.331 | +0.00 |
| Processing: Dry Cold Pressed | no | -6.713 | +0.00 |
| Processing: Dry Baked | no | -6.713 | +0.00 |
| Processing: Dry Extruded | yes | -6.713 | -6.71 |
| Processing: Dry Semi Moist | no | -6.174 | +0.00 |
| Processing: Dry Muesli | no | -10.146 | +0.00 |
| Processing: Wet Pate | no | -0.672 | +0.00 |
| Processing: Wet Chunks | no | -0.672 | +0.00 |
- Processing-type offset
- +0.02
- Additives declared on label
- +2 transparency bonus
- Subtotal
- 47.8
- Final score
- 48/100
Contributions are rounded to two decimals, so they may not sum exactly to the subtotal. The full coefficient table is published on the methodology page.
Nutritional: declared analysis vs reference ranges
How the declared analysis compares with FEDIAF reference ranges for adult dogs. The label prints as-fed values; we convert to a dry-matter basis before scoring, and the bands are dry-matter ranges. Scores rise to 100 at the band midpoint: the reference is adequacy, not maximisation. Nutrients with a published upper limit taper again above it; fat is policed through calorie density rather than a direct penalty.
Guaranteed-analysis FEDIAF score: crude minimums and maximums are bounds, not typical values; moisture (a maximum) uses the processing median where available; experimental US score.
| Nutrient | As fed (label) | Dry matter (scored) | Score |
|---|---|---|---|
| Protein | 22 | 24.3 (band 18 to 40%) | 87.2 |
| Fat | 12 | 13.3 (band 5.5 to 20%) | 100 |
| Fibre | 4 | 4.4 (band 0.5 to 5%) | 100 |
| Calcium | 1 | 1.1 (band 0.5 to 2.5%) | 88.1 |
| Phosphorus | 0.8 | 0.9 (band 0.4 to 1.6%) | 94.2 |
| Calcium:phosphorus ratio | 1.3 | 1.3 (band 1 to 2%) | 85 |
| Omega fatty acids (omega-6 and omega-3) | - | - | 100 |
| Energy (kcal/100g) | 344 | 380.1 | 100 |
Omega fatty acids (omega-6 and omega-3): scored as the mean of its declared components (omega-6 100). The FEDIAF minimum for omega-6 is linoleic acid specifically.
Scored over 8 declared nutrients (combined weight 100); undeclared nutrients do not affect the score. Moisture was not declared and was estimated at 9.5% from the food type.
Low confidence: partial analysis or moisture estimated from the food type.
This measures agreement with published reference ranges, not suitability for an individual dog. For medical conditions, follow veterinary guidance.
Transparency: what the label discloses
How much the manufacturer discloses, measured against the FEDIAF Code of Good Labelling Practice and Regulation 767/2009. Mandatory items dominate the weighting.
| Item | Points |
|---|---|
| Ingredient list on the label (mandatory) | 10/10 |
| Printed percentages on the label (voluntary) - not on file | 0/20 |
| Analytical constituents declared (mandatory) - not on file | 0/15 |
| Additives declared (mandatory) | 10/10 |
| Energy value declared (voluntary) | 5/5 |
| Complete/complementary designation (mandatory) | 5/5 |
| Feeding guidance given (mandatory) | 10/10 |
| Manufacturer identity and address (mandatory) | 5/10 |
| Country of manufacture stated (voluntary) | 10/10 |
| Batch and date labelling (mandatory) - not on file | 0/5 |
Capped at 60: mandatory items missing (Analytical constituents declared, Batch and date labelling).
Safety: recall history
Recall and safety-notice history, time-decayed. This dimension is shown alongside the score and never feeds the headline number.
No recalls recorded in our database.
Evidence: what the brand claims, and what supports it
The claims made on the pack and product page, checked against the declared label. We record claims as stated; "consistent" means our stored label data supports the claim, "contradicted" means it conflicts with it. Functional claims are recorded but never scored.
Claims on file; none we can check against the label
| Claim | Type | Check | Substantiation |
|---|---|---|---|
| Formulated for moderately active adult dogs (on pack) | Functional | not checkable | Manufacturer assertion |
| Omega fatty acids help support healthy skin and shiny coat (on pack) | Functional | not checkable | Manufacturer assertion |
| Guaranteed probiotics — 80 million colony forming units (CFU) per pound for digestive and immune system support (on pack) | Functional | not checkable | Manufacturer assertion |
| Each ingredient in Diamond Maintenance is intentionally chosen to provide complete and balanced nutrition for adult dogs (on pack) | Functional | not checkable | Manufacturer assertion |
| Omega fatty acids from chicken fat are essential for healthy skin, a shiny coat and overall well-being (on pack) | Functional | not checkable | Manufacturer assertion |
| K9 Strain Probiotics, beneficial bacteria that help support digestive and immune systems and help your dog maintain an active lifestyle (on pack) | Functional | not checkable | Manufacturer assertion |
| Made with purposeful, quality ingredients (on pack) | Content | not checkable | Manufacturer assertion |
| 22% protein and 12% fat (on pack) | Nutrient | not checkable | Manufacturer assertion |
The full scoring method is published. See the methodology for exactly how the headline score and each dimension are calculated.
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