NF Kidney Function Dry Dog Food, 25-lb bag
Purina Pro Plan Veterinary Diets NF Kidney Function Dry Dog Food, 25-lb bag earns a Sniff Score of 39/100 (D) with Fair evidence. 1 controversial ingredient flagged. Score capped at 49 due to CP_DM=14.2%, CF_DM=14.8%.
Graded by The Sniff System
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..
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.
- 2grainrice
Generic rice. Could be white or brown, the label doesn't say. Brown rice would be specified if it were.
- 3dried egg product
Whole eggs with the water removed. Same nutritional value as fresh eggs, just shelf-stable.
- 4animal fat preserved with mixed tocopherols
- 5sugar
Added sugar. No nutritional purpose for dogs. Most often found in budget semi-moist foods.
- 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.
- 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.
- 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.