AAFCO definition and how lard is produced
Per AAFCO 2024 Official Publication ingredient definition 33.5, lard is “the rendered fat from pork tissue, exclusive of any added free fatty acids or other materials.” Production parallels the rendering process for chicken fat and beef tallow: pork adipose tissue (typically backfat, leaf fat, or trimmings from meat-processing operations) is heated to 115–145°C in wet or dry rendering vessels, separated from protein-mineral solids, filtered, and stabilized with antioxidants for shelf life. The rendering temperature is sufficient to destroy Trichinella spiralis larvae and other pork-borne pathogens per Aldrich 2006 (Petfood Industry) review — the parasite-safety case for rendered lard rests on this thermal kill step.
The pet-food terminology distinguishes between “lard” (rendered backfat or higher-grade fat, traditionally lighter color and milder flavor) and “pork fat” (often used interchangeably or for lower-grade rendered fractions). AAFCO 2024 does not separately define “pork fat” — the regulatory ingredient name is lard. Some pet food labels may use the more generic term “animal fat” (AAFCO 9.43, species-anonymous) when the supplier blends pork with other animal fats. See our chicken fat explainer and beef tallow explainer for the named-species fat siblings.
Fatty acid profile — the USDA FoodData Central numbers
Per USDA FoodData Central reference data, the fatty acid composition of lard is approximately 40% saturated, 45% monounsaturated, 11% omega-6 polyunsaturated (linoleic acid, 18:2 n-6), and 1% omega-3 polyunsaturated (alpha-linolenic acid, 18:3 n-3). The saturated fraction is dominated by palmitic acid (24%) and stearic acid (14%); the monounsaturated fraction is dominated by oleic acid (44%); the omega-6 fraction is essentially all linoleic acid; the omega-3 fraction is alpha-linolenic acid only.
For comparison, USDA FoodData Central reports chicken fat at approximately 30% saturated / 47% MUFA / 19% omega-6 / 1% omega-3, beef tallow at 50% / 42% / 4% / 0.6%, and salmon oil at 21% / 29% / 2% / 33% omega-3 (EPA + DHA + ALA). Lard sits between chicken fat and beef tallow on saturation and palmitic-acid content, but delivers approximately half the linoleic acid of chicken fat. Per AAFCO 2024 Dog Food Nutrient Profiles, the linoleic acid minimum is 1.3% on a dry-matter basis for adult maintenance — a kibble with lard as the only added fat at 12% dry-matter inclusion delivers approximately 1.3% linoleic acid (right at the minimum), versus 2.3% for the same level of chicken fat.
Oxidative stability — the Erkkila 2006 reference
Per Erkkila 2006 (Lipid Technology) review of animal fat oxidative stability, the order of stability at standard storage temperatures is: beef tallow > lard > chicken fat > fish oils. The driver is degree of unsaturation: more carbon-carbon double bonds means more sites for oxidation per molecule. Lard at 12% polyunsaturated total is more oxidatively stable than chicken fat at 20% polyunsaturated, but less stable than beef tallow at 4% polyunsaturated.
The practical implication for pet food: lard requires antioxidant preservation in dry kibble. Common antioxidant systems include mixed tocopherols (natural vitamin E), rosemary extract, citric acid, ascorbyl palmitate, and the synthetic options BHA / BHT / ethoxyquin. Per Frankel 1996 (J Agric Food Chem), mixed tocopherols are effective for moderate-PUFA fats like lard at storage shelf-life targets of 12–18 months. See our mixed tocopherols explainer and rosemary extract explainer for the natural antioxidant systems used in carnivore-style and lard-containing formulations.
The omega-3 limitation and why lard cannot substitute for fish oil
Per Bauer 2008 (JAVMA) and Bauer 2011 (JAVMA) canine fatty acid reviews, the canine conversion of dietary alpha-linolenic acid (ALA, the 18-carbon omega-3 in plant and animal-fat sources) to long-chain EPA and DHA (the 20- and 22-carbon omega-3s with measurable osteoarthritis, skin, and cardiac evidence) is under 5% in dogs. Lard at 1% ALA in 12% dry-matter inclusion delivers approximately 0.12% ALA on a dry-matter basis — which after the under-5% conversion is approximately 0.006% effective EPA + DHA, well below the AAHA 2022 osteoarthritis dose target of 100–310 mg combined EPA+DHA per kg body weight per day.
The practical conclusion: lard is a calorie-dense palatability and saturated-fat source, not an omega-3 source. Pet foods using lard as the primary fat must add a fish oil (salmon oil, sardine oil, anchovy oil, or krill oil) for therapeutic omega-3 dosing. See our omega-3 fatty acids explainer, salmon oil explainer, and krill oil explainer for the omega-3 supply pathways.
How KibbleIQ scores lard
The KibbleIQ Dry Kibble Rubric scores lard as an acceptable named-species fat: AAFCO-defined, traceable, and adequate for the AAFCO Dog Food Nutrient Profiles fat minimum when present at typical pet-food inclusion (8–15% dry matter). The rubric ranks lard above species-anonymous animal fat (AAFCO 9.43) on label transparency — pork is named, supply chain is traceable, and ICADA 2015 elimination-diet protocols can use or exclude lard reliably.
The rubric does not award additional credit for ancestral-diet or carnivore-style positioning when lard is used in those formulations. Per Wakshlag 2014 (Vet Clin North Am Small Animal Practice) review, dogs are metabolically flexible across saturated/MUFA/PUFA ratios within AAFCO 2024 minimums; ancestral-positioning claims are marketing, not nutrient-based. The rubric flags lard-primary formulations as needing supplemental omega-3 from marine sources to meet AAHA 2022 osteoarthritis and skin-support thresholds. See best dog food for skin and coat and poultry fat explainer for the relevant fat-source comparisons. To check your dog’s food, paste the ingredient list into the KibbleIQ analyzer.