Dogs need about 40 essential nutrients from their food, and homemade diets frequently fall short on several of them. Getting the balance right requires more than combining meat, rice, and vegetables. You need adequate protein, fat, a careful calcium-to-phosphorus ratio, specific vitamins, and trace minerals that whole foods alone rarely provide in sufficient amounts.
Protein and Essential Amino Acids
Protein should make up at least 18% of your dog’s diet on a dry matter basis for adult maintenance. That minimum comes from AAFCO, the organization that sets nutrient standards for pet food in the United States. In practical terms, animal-based proteins like chicken, beef, turkey, fish, and eggs should form the foundation of a homemade diet because they deliver complete amino acid profiles.
Dogs require 10 essential amino acids they cannot manufacture on their own: arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Animal proteins supply all 10 reliably. Plant proteins like lentils or beans can contribute, but they’re incomplete on their own and harder for dogs to digest in large quantities. If you’re using a single protein source, rotating between different meats over time helps cover any gaps in the amino acid profile.
Fat and Fatty Acids
Fat is the most calorie-dense part of your dog’s diet and needs to reach at least 5.5% on a dry matter basis. Beyond raw energy, fat carries fat-soluble vitamins and provides the essential fatty acids your dog can’t produce internally.
Omega-6 fatty acids, particularly linoleic acid, are critical for healthy skin and coat. Most animal fats and common cooking oils like sunflower or safflower oil supply these adequately. Omega-3 fatty acids, specifically EPA and DHA, support joint health, brain function, and help regulate inflammation. Fish oil or oily fish like sardines and mackerel are the most efficient sources. Plant-based omega-3s (like flaxseed oil) provide ALA, which dogs convert to EPA and DHA very inefficiently, so they’re not a reliable substitute for fish-derived sources.
Calcium and Phosphorus
This is where most homemade diets go wrong. Meat is rich in phosphorus but contains almost no calcium, so a diet built around muscle meat without a calcium supplement creates a dangerous imbalance. Over months, this leads to weakened bones as the body pulls calcium from the skeleton to compensate.
The recommended calcium-to-phosphorus ratio falls between 1:1 and 2:1. A practical way to hit this target is ground eggshell powder: half a teaspoon provides roughly 1,000 milligrams of calcium. The general guideline is to add 800 to 1,000 milligrams of calcium per pound of fresh food. So if your dog eats half a pound of food per meal, you’d add about a quarter teaspoon of ground eggshell.
For growing puppies, bone meal is a better choice because it supplies both calcium and phosphorus, and puppies need proportionally more phosphorus than adults. Each bone meal brand varies in concentration, so check the label and aim for 1,000 to 1,200 milligrams of calcium per pound of food. One note of caution: calcium from bone meal, oyster shell, and dolomite can be contaminated with lead, so choose brands that test for heavy metals.
The Nutrients Most Likely to Be Missing
A study analyzing published homemade dog food recipes found that the vast majority were deficient in multiple nutrients. The most commonly lacking ones, ranked by how often recipes fell short:
- Copper and choline: deficient in 85% of recipes
- Vitamin E: deficient in 83% of recipes
- Zinc: deficient in 76% of recipes
- Calcium: deficient in 73% of recipes
- Iron: deficient in 68% of recipes
- Riboflavin and vitamin B12: deficient in 66% and 61% of recipes
These numbers explain why veterinary nutritionists consistently recommend a vitamin and mineral supplement for homemade diets. Whole foods alone, even well-chosen ones, leave significant gaps in trace minerals and certain vitamins.
Why Organ Meats Matter
Organ meats are among the most nutrient-dense foods you can add to a homemade diet, and they help close several of the gaps listed above. They’re not optional extras. Think of them as nature’s multivitamin for dogs.
Liver is packed with vitamin A, iron, zinc, folate, riboflavin, and niacin. It’s so rich in vitamin A that it should be limited to roughly 5% of the total diet to avoid toxicity. Kidney provides vitamin B12, iron, folate, thiamin, and riboflavin. Heart is technically a muscle, but it’s the best natural source of coenzyme Q10 and delivers iron, zinc, thiamin, B12, potassium, and selenium. Including a rotation of these organs, totaling about 10% to 15% of the diet, addresses several common deficiency risks at once.
Trace Minerals: Zinc, Iron, and Copper
These three minerals are consistently under-supplied in homemade recipes. AAFCO minimum levels for adult dog food are 8.0 mg of zinc, 4.0 mg of iron, and 0.73 mg of copper per 100 grams of food on a dry matter basis. Those numbers sound small, but reaching them through whole food alone is harder than it appears.
Zinc deficiency shows up as dull coat, flaky skin, and slow wound healing. Red meat and organ meats are the best whole-food sources, but many dogs on homemade diets still need supplemental zinc. Iron deficiency causes lethargy and weakness. Liver and red meat help, but the amount needed to hit minimum levels can be more than what fits comfortably in a balanced recipe. Copper works closely with iron in forming red blood cells, and it’s one of the hardest minerals to supply adequately from food alone.
There are also safe upper limits to respect. Zinc should stay below 22.7 mg per 100 grams of dry matter, and copper below 2.8 mg. More is not better with trace minerals, and supplementing without knowing your recipe’s baseline levels can push into toxic ranges.
Vitamins Your Dog Needs
Dogs require both fat-soluble vitamins (A, D, E, and K) and water-soluble B vitamins plus choline. Fat-soluble vitamins are stored in body fat and the liver, which means both deficiency and toxicity develop slowly and can sneak up on you.
Vitamin A supports vision, immune function, and cell growth. Liver is the richest source, but too much causes vitamin A toxicity over time. Vitamin D is essential for calcium absorption. Unlike humans, dogs can’t produce meaningful vitamin D from sunlight, so it must come from food. Oily fish, egg yolks, and liver all contribute, but most homemade diets still fall short without supplementation. Vitamin E acts as an antioxidant and protects cell membranes. With 83% of homemade recipes deficient in it, a vitamin E supplement or foods like sunflower seeds and spinach are worth incorporating.
The B vitamins, including thiamin, riboflavin, niacin, B6, B12, folate, and pantothenic acid, support energy metabolism, nerve function, and red blood cell production. Organ meats cover several of these well. Choline, which is sometimes grouped with B vitamins, supports liver function and brain health. It was deficient in 85% of analyzed recipes, making it one of the most overlooked nutrients. Egg yolks and liver are the best whole-food sources.
Carbohydrates and Fiber
Dogs have no strict carbohydrate requirement. They can generate glucose from protein and fat. That said, cooked grains like rice, oats, and quinoa, along with starchy vegetables like sweet potatoes, provide easy energy and can reduce the cost of a homemade diet. They also supply some B vitamins and fiber.
Fiber from vegetables like green beans, pumpkin, and carrots supports healthy digestion and feeds beneficial gut bacteria. A diet made entirely of meat and fat, with no plant matter, often leads to inconsistent stool quality. Most balanced homemade diets include 20% to 30% carbohydrate sources by volume.
Putting It All Together
A nutritionally complete homemade dog diet typically includes muscle meat as the protein base, organ meats (especially liver and heart) for micronutrients, a calcium source like ground eggshell, a fat source including fish oil for omega-3s, and cooked vegetables or grains for fiber and energy. Even with all of these components, a broad-spectrum vitamin and mineral supplement designed for homemade dog diets is almost always necessary to cover zinc, copper, vitamin E, choline, and other consistently deficient nutrients.
The safest approach is to have a veterinary nutritionist formulate or review your recipe at least once. Services like BalanceIT and PetDietDesigner allow you to input your ingredients and check the nutrient profile against established standards. The cost is modest compared to the risk of a deficiency that takes months to become visible but can cause real, lasting harm to your dog’s bones, organs, and immune system.