Pet Food Glossary

• AAFCO — Association of American Feed Control Officials — the standards body for US pet food.
• AAFCO statement — The required label declaration of nutritional adequacy and life-stage appropriateness.
• Amino acid — Building block of protein. Some are essential — must come from diet.
• Animal by-product — Parts of an animal not commonly consumed by humans, used as protein source in pet food.
• As-fed — Nutrient percentages stated in the food's original moist state, before water removal.
• Ash — Mineral content of a pet food — calcium, phosphorus, sodium, magnesium, etc.
• Bioavailability — How much of a nutrient is actually absorbed and used by the animal.
• BHA / BHT — Butylated hydroxyanisole and butylated hydroxytoluene — synthetic antioxidant preservatives.
• Calcium — Essential mineral required for bones, teeth, muscle, and nerve function.
• Carrageenan — Seaweed-derived thickener common in wet pet food, with documented inflammatory effects.
• Cat nutrition — Cats are obligate carnivores with several diet requirements dogs don't share.
• Chelated mineral — Mineral bound to an amino acid for improved absorption.
• Complete and balanced — Diet meeting AAFCO nutrient profiles for the labeled life stage.
• Controversial ingredient — An ingredient with documented or suspected health concerns in peer-reviewed research.
• Crude protein — Total nitrogen × 6.25 — a chemistry estimate of protein content, not amino acid quality.
• DCM (Dilated Cardiomyopathy) — A heart muscle disease in dogs that the FDA has linked to certain grain-free diets.
• DHA — Docosahexaenoic acid — an omega-3 fatty acid critical for brain and eye development.
• Dry-matter basis — Nutrient percentages calculated after removing all moisture, for fair comparison.
• Ethoxyquin — Synthetic preservative once widely used in pet food, now restricted in many markets.
• Extrusion — The high-heat, high-pressure manufacturing process used for nearly all dry kibble.
• Fatty acid — Building blocks of dietary fat. Some are essential and must come from food.
• Feeding trial — AAFCO-protocol study where real animals are fed the diet to verify nutritional adequacy.
• Filler — Low-cost, low-nutrition ingredients used to bulk up pet food.
• Filler ratio — The proportion of a product's ingredient list made up of low-value fillers.
• Fish oil — Concentrated source of omega-3 EPA and DHA — the strongest signal of intentional omega-3 supplementation.
• Food allergy — Immune-mediated reaction to a specific dietary protein — less common than commonly believed.
• Grain-free — Pet food without corn, wheat, soy, rice, or other grains — typically using legumes or potatoes instead.
• Guaranteed analysis — Required label declaration of minimum protein/fat and maximum fiber/moisture.
• Ingredient splitting — Listing one ingredient in multiple forms so each appears lower on the deck.
• Kibble — Dry, extruded pet food in pellet form — the dominant form factor in US pet food.
• Legume — Plant family including peas, lentils, chickpeas — common in grain-free pet food.
• Life stage — AAFCO category determining nutritional requirements: growth, maintenance, or all life stages.
• Meat meal — Rendered, dried, ground animal protein — concentrated source of dry-matter protein.
• Menadione — Synthetic vitamin K3 supplement used in pet food, with documented liver toxicity in animal studies.
• Mixed tocopherols — Natural vitamin E used as a fat preservative — the modern alternative to BHA/BHT/ethoxyquin.
• Named protein — Protein source from a specifically identified animal — "chicken" rather than "meat."
• Nutrient profile — AAFCO's published minimum nutrient requirements for dog or cat food.
• Omega-3 — Essential fatty acids supporting brain, joint, and skin health.
• Preservative — Compounds added to prevent rancidity and bacterial growth in pet food.
• Puppy nutrition — Growing puppies need higher protein, fat, calcium, and DHA than adult maintenance — and large breeds need controlled calcium.
• Rendering — Industrial process that converts animal tissue into protein meal and tallow.
• Supplement — Vitamins, minerals, and amino acids added to meet AAFCO nutrient minimums.
• Taurine — Essential amino acid for cats; conditional for dogs. Critical for heart and eye health.
• Thickener — Ingredient added to wet food to create gel, gravy, or paste texture.
• Topper — Add-on food not designed to be the sole diet — labeled "for intermittent or supplemental feeding."
• Veterinary nutritionist — Vet board-certified in nutrition through the ACVN or ECVCN — about 100 in the US.
• WSAVA — World Small Animal Veterinary Association — publishes pet food selection guidelines.
• Wet food — High-moisture pet food in cans, pouches, or trays — typically 75–82% water.