Before there was kibble, before there were pet stores, before anyone had ever written "complete and balanced" on a bag of food - dogs ate organs.
Wolves, the direct ancestors of every dog alive today, didn't hunt to get muscle meat. They hunted to eat everything. The liver. The kidney. The heart. The lungs. The stomach contents. When a wolf brought down prey, the organs were the first thing eaten — not a byproduct of the hunt, but the primary prize.
That's not ancient history. That's your dog's biology. And it matters more than most owners realise.
Why Organs? The Nutritional Case
Organ meats are not "scraps." They are the most nutrient-dense foods that exist on earth... more concentrated in vitamins, minerals, and bioavailable nutrients than any plant, grain, or synthetic supplement.
Liver
Gram for gram, beef liver is one of the most powerful foods in existence. A 100g serving contains:
- Vitamin A (retinol): Up to 10x the daily requirement for dogs — in a form the body uses immediately
- Vitamin B12: Critical for nervous system function and red blood cell production
- Heme iron: Absorbed at 15–35%, vs 2–20% for plant-based iron
- Copper: Essential for iron metabolism, connective tissue, and immune function
- CoQ10: A powerful antioxidant supporting heart and mitochondrial function
Liver is also rich in choline — critical for brain development and frequently deficient in commercial dog diets.
Kidney
Kidney is packed with B vitamins (particularly B2 and B12), selenium, iron, and zinc. In traditional nutrition, kidney was considered a health food precisely because of its concentrated micronutrient profile.
Heart
Heart is one of the richest natural sources of CoQ10 - fundamental for cellular energy production. It's also high in taurine, an amino acid essential for cardiac function. The connection between taurine deficiency and dilated cardiomyopathy (DCM) in dogs has received significant veterinary attention in recent years.
What Happens When Dogs Don't Get Organ Meats
The consequences of an organ-poor diet show up over time, not overnight. But they do show up:
- Iron deficiency: Lethargy, pale gums, low stamina
- Zinc deficiency: Flaky skin, dull fur, slow wound healing, recurrent ear infections
- B vitamin deficiencies: Fatigue, poor neurological function, digestive irregularity
- Taurine insufficiency: Linked to increased DCM risk in predisposed breeds
- CoQ10 depletion: As dogs age, dietary CoQ10 from heart meat becomes essential
The Freeze-Drying Difference
Not all organ supplements are created equal.
Many products use dried or dehydrated organs — which involves heat and results in significant nutrient loss. Freeze-drying removes moisture at extremely low temperatures under a vacuum, preserving the enzymatic activity, nutrient density, and bioavailability of the original raw ingredient without cooking or chemical processing.
The result is organ meat with a nutritional profile almost identical to fresh raw, in a shelf-stable form. You can't put liver in a pill. You can freeze-dry it.
The Bottom Line
Beef organs aren't a trend. They're not a marketing angle. They're the food your dog evolved eating, stripped from their diet by the industrialisation of pet food.
Liver for iron, B12, and Vitamin A. Kidney for B vitamins and selenium. Heart for CoQ10, taurine, and cardiac support. These aren't supplements in the traditional sense — they're food. Real, whole, ancestrally appropriate food.
Sources
- Czerwonka, M., & Tokarz, A. (2017). Iron in red meat — friend or foe. Meat Science, 123, 157–165. View study
- Freeman, L.M., et al. (2018). Diet-associated dilated cardiomyopathy in dogs. JAVMA. View study
- Fascetti, A.J., et al. (2003). Taurine deficiency in dogs with dilated cardiomyopathy. JAVMA, 223(8), 1130–1136.
- Lenox, C.E. (2016). Role of dietary fatty acids in dogs and cats. Today's Veterinary Practice.
