NF Kidney Function Dry Dog Food, 25-lb bag
Graded by The Sniff System
Purina Pro Plan Veterinary Diets NF Kidney Function Dry Dog Food is a dry veterinary diet, formulated for kidney support, with a recipe dominated by plant proteins.
This formula includes quality fat sources, like named animal fat with marine oil, which provides EPA and DHA. It also features dried egg product for diverse, highly bioavailable protein. The product has AAFCO feeding trial substantiation, which is a strong point for a veterinary diet.
The formula is plant-protein-dominated, with whole grain corn as the first ingredient. It also contains menadione, a synthetic vitamin K3, which is banned in human supplements due to toxicity concerns.
Good fit for dogs requiring a veterinary diet for kidney support. Less ideal if you prefer formulas without synthetic vitamin K or primarily animal protein.
Summary written by The Sniff System from the data above. Same rubric, same drivers, expressed in English.
Good fit for adult Golden Retrievers and similar active sporting breeds navigating diet-associated DCM concerns. Dried egg product anchors position 3, with zero pulses in the top 15, plus liver flavor at position 7 (a natural taurine precursor). In its 2022 update on diet-associated DCM, the FDA identified Golden Retrievers as the most reported breed, with 121 cases out of 1,382 total canine reports (8.8%) received between January 1, 2014, and November 1, 2022 (FDA, 2022) .
Looking at this for adult Golden Retrievers or Golden Retrievers with diet-associated DCM concerns ? We are building dedicated pages for these combinations.
Auto-matched from this product's measurements (ingredients, life stage, calorie density) to a breed archetype. Not a substitute for vet input on your specific dog.
Research informing this analysis
MethodologyThe Sniff System grades this product against 3 cited studies relevant to its profile. Each link opens the original source.
- FDA, 2022cardiac · epidemiology · breed predisposition· cited in 5 claims
- FDA, 2019diet composition· cited in 2 claims
- NRC, 2006nutrient bioavailability
Every claim on Sniff traces to a source. If you find a citation that's wrong, outdated, or misapplied, tell us.
Below-average grade. 39/100 (D) reflects the structural fit of this formula against The Sniff System's eight scoring components. Fat quality did the heavy lifting (+12 points): Quality fat sources: named fat with marine oil (EPA and DHA source). What capped it: the score can't exceed 49 because the guaranteed analysis falls below AAFCO's minimum nutrient profile. Removing the cap alone wouldn't change the band. Protein quality is the deeper issue.
Quality fat sources: named fat with marine oil (EPA and DHA source).
AAFCO feeding trial substantiation for not stated.
Includes egg, named fish, or organ meat for diverse high-bioavailability protein.
Plant-protein-dominated formula. whole grain corn as the #1 ingredient.
Contains menadione. Banned for human OTC use but tolerated at AAFCO-permitted levels in pet food. The only AAFCO-permitted vitamin K source..
- Top 5% for caloric density in Purina Pro Plan Veterinary Diets's lineup (444 kcal/cup)
- Bottom 2% for crude fiber in grain-inclusive dry kibbles (2.8% DMB)
- Bottom 2% for carb quality in grain-inclusive dry kibbles (9/16)
Computed against the rest of our catalog. Percentiles refresh on each catalog update.
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$4.80/lb vs your seed's $5.12/lb (6% less) at a comparable score.
Surfaced from a vector similarity search across 3,491 scored dog foods. How this works.
Controversial ingredients · 1
- menadioneSynthetic vitamin K3. Banned in human supplements due to toxicity concerns at high doses. Permitted in pet food but premium brands use natural vitamin K alternatives.
Every flagged ingredient has a published basis (confirmed harm / regulatory action / precautionary). See methodology →
Read why each ingredient is good or bad for dogs.
- 1grainwhole grain corn
Whole corn with the kernel intact. Decent fiber and B vitamins, though it can crowd out meat in cheaper recipes.
Position 1 grain: primary carbohydrate base. This is a grain-inclusive formula with whole grain corn as the dominant carb.
- 2grainrice
Generic rice. Could be white or brown, the label doesn't say. Brown rice would be specified if it were.
Position 2: major carbohydrate source.
- 3dried egg product
Whole eggs with the water removed. Same nutritional value as fresh eggs, just shelf-stable.
Position 3: significant protein contributor. Adds amino-acid diversity to the top of the deck.
- 4animal fat preserved with mixed tocopherols
Position 4: secondary fat. Often where marine oils sit when present alongside a primary land-animal fat.
- 5sugar
Added sugar. No nutritional purpose for dogs. Most often found in budget semi-moist foods. See why →
- 6glycerin
Humectant used in soft-moist foods to keep them chewy. Safe in moderation but a signal of a processed semi-moist product.
- 7liver flavor
- 8othernatural flavor
Legal term for animal-derived flavoring, usually hydrolyzed liver or broth. Adds taste, says nothing about quality.
- 9dried whey
- 10sodium caseinate
- 11mineralcalcium carbonate
Source of calcium. Functional. Required in complete dog foods, especially those without bone-in meat meals.
- 12vegetable oil
Unnamed plant oil. Could be soy, canola, corn, or a blend. Named oils like sunflower or canola are more transparent.
Position 12: trace fat. Below the level that materially shifts the fat profile.
- 13l-lysine monohydrochloride
Stable form of L-lysine, an essential amino acid. Common in plant-heavy formulas to balance the amino acid profile.
- 14mineralpotassium chloride
Required mineral. Sometimes used as a salt substitute. Standard inclusion in complete diets.
- 15fatfish oil
Concentrated omega-3s. The reason 'EPA' and 'DHA' get to show up on the bag.
Position 15. Trace marine oil. Contributes some omega-3 but well below the level that drives EPA/DHA totals.
- 16potassium citrate
Source of potassium. Sometimes added in urinary-support formulas to help manage urine pH.
- 17mineralsalt
Sodium chloride. Required at small doses for normal physiology. Not a quality concern in standard amounts.
- 18vitaminvitamin e supplement
Required nutrient and a natural antioxidant. Often pulls double duty as a preservative.
- 19supplementcholine chloride
Essential nutrient for liver and brain function. Standard inclusion in complete dog foods.
- 20mineralzinc sulfate
Inorganic zinc. Effective at AAFCO doses but less well-absorbed than chelated forms like zinc proteinate.
- 21supplementl-tryptophan
Essential amino acid. Sometimes added in calming or weight-management formulas.
- 22mineralferrous sulfate
Inorganic iron. Standard mineral source. Iron proteinate is the gentler, better-absorbed premium form.
- 23mono and dicalcium phosphate
Source of calcium and phosphorus. Standard inclusion in complete dog foods.
- 24vitaminniacin supplement
B vitamin (B3). Required in complete dog foods, added as a supplement to standardize the dose.
- 25mineralmanganese sulfate
Inorganic manganese. Functional but less well-absorbed than the chelated proteinate form.
Showing first 25 of 39. Position 1-5 has the largest weight in the recipe.
21 of 25 ingredients have a curated note. Coverage grows over time.