Canine Nutrition • Essential Guide • October 2026

Essential Nutrients for Dogs: A Complete Guide to a Balanced Diet

The essential nutrients dogs need are water, protein (which supplies ten essential amino acids), fat (which supplies essential fatty acids), vitamins and minerals. Carbohydrate has no set requirement and adds energy and fibre. A complete food made to FEDIAF guidelines supplies them in the right proportions.

This Petsprod guide explains what each nutrient does, what FEDIAF sets as the minimum for adult dogs, and how to check that a food or recipe supplies them. It sits within our wider dog nutrition coverage.

The advice applies to healthy adult and senior dogs. A dog with a medical condition needs a diet plan from their vet.

What are the essential nutrients for dogs?

Dogs need water, protein, fat, vitamins and minerals every day, in the right amounts and proportions to one another. UK Pet Food counts around 37 individual nutrients that a dog needs each day. [2] Carbohydrate adds energy and fibre and has no set minimum.

Protein and the ten essential amino acids

Protein supplies ten essential amino acids that must come from food: arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. [3] Dogs can usually make taurine from methionine and cysteine.

Different protein sources have different amino acid profiles. A food maker combines ingredients so that every requirement is met, which is why the source of the protein matters as well as the percentage on the bag. Dogs make the remaining amino acids themselves.

Protein builds and repairs muscle, skin and coat, and it forms enzymes and immune cells. The guide to amino acids for dogs covers each one.

Fat and essential fatty acids

Fat is the most concentrated energy source in a dog’s food, giving more than twice the energy per gram of protein or carbohydrate. It also supplies essential fatty acids and helps the body absorb vitamins A, D, E and K.

Linoleic acid, an omega-6 fatty acid, is the main essential fatty acid, and it helps keep skin and coat in condition. Fish oil supplies the long-chain omega-3s EPA and DHA, which are covered under omega 3 for dogs.

Rich scraps raise calories fast, and a sudden fatty meal can upset the stomach.

Are carbohydrates essential for dogs?

Dogs have no set carbohydrate requirement, because they can make the glucose they need from amino acids and other substances. Cooked starch from rice, oats or potato is still a digestible energy source, and fibre helps the gut work properly.

Soluble fibre feeds gut bacteria, and insoluble fibre adds bulk to stools. A firm, easy-to-collect stool is a quick everyday check that the mix suits the dog. Do dogs need carbohydrates looks at sensible amounts.

Which vitamins are essential for dogs?

Dogs need the fat-soluble vitamins A, D, E and K, and the water-soluble B vitamins and choline, in small amounts every day. Fat-soluble vitamins can build up in the body, so an excess can cause harm.

Dogs get almost all their vitamin D from food, so a diet that lacks it can’t be corrected with sunshine. Dogs make their own vitamin C, so it has no set dietary requirement.

Each vitamin has its own job, from vision (vitamin A) to protecting cells from oxidative damage (vitamin E). The page on vitamins dogs need goes through them one by one.

Which minerals are essential for dogs?

Dogs need calcium, phosphorus, potassium, sodium and magnesium in larger amounts, and iron, zinc, copper, manganese, iodine and selenium in trace amounts. Calcium and phosphorus build bones and teeth, iron carries oxygen in the blood, zinc supports skin repair and iodine supports the thyroid.

Calcium and phosphorus have to be in proportion as well as in the right amounts. The Merck Veterinary Manual gives an optimal ratio of about 1.2 to 1.4:1, with AAFCO accepting 1:1 to 2.1:1. [3] That is why random calcium powders can do harm. The guide to minerals dogs need covers the rest.

Why is water an essential nutrient for dogs?

Dogs need fresh water available at all times, and the bowl should be checked and refilled regularly. [4] Water carries out digestion, temperature control and waste removal, and wet food holds more of it than dry food.

Daily amounts vary with size, weather and activity. See how much water should a dog drink for guidance.

How much of each nutrient does a dog need?

FEDIAF’s minimum levels for a healthy adult dog are 45.0 to 52.1 g of protein, 13.75 g of fat, 1.25 to 1.45 g of calcium and 1.00 to 1.16 g of phosphorus per 1,000 kcal of metabolisable energy. [1]

*Calculated at 4,000 kcal per kg of dry matter from FEDIAF’s published tables. [1] FEDIAF reviews them every year, so check the current edition for exact values.

FEDIAF gives a range because it bases the figures on two energy intakes. A dog that eats less needs a denser food, so the higher figure applies. These figures are minimums, and a dog on a complete food doesn’t need them calculated. They matter mainly when judging a recipe.

AAFCO and the NRC also list maximum levels for nutrients with potential toxicity. [3]

How can you tell if dog food is nutritionally complete?

A nutritionally complete dog food says “complete” on the pack, names the dog’s life stage and is formulated to FEDIAF nutrient profiles. Dogs Trust says a good complete food should provide all the essential nutrients. [4]

UK Pet Food members commit to formulating diets in line with European guidelines. [2] A complementary food, such as a treat or mixer, has to be fed alongside a complete diet and can’t be the whole ration. Complete vs complementary dog food explains the difference.

Look at three things on the label:

• The complete or complementary statement
• The life stage the food is made for
• The ingredient list, which runs in descending order of weight

Should you add supplements to complete food?

A dog eating a complete food rarely needs extra supplements, because the vitamins and minerals are already in the recipe. Extra calcium or a multivitamin can push levels past the maximum, so ask your vet first.

Do dogs need supplements explains when a vet might advise one.

What about homemade and raw diets?

Homemade and raw diets are hard to balance. Dogs Trust recommends buying commercial dog food and seeking veterinary advice before feeding either. UK Pet Food says most homemade diets are nutritionally deficient.

Meat alone is low in calcium, so a plate of chicken and rice leaves a gap. A recipe written by a vet or animal nutritionist, with every ingredient weighed in grams, is the safest route. The page on home-cooked dog food covers what a nutritionist checks.

How do you apply these nutrients to your dog’s meals?

A nutrient list doesn’t tell you how much to put in the bowl. That depends on your dog’s size, age and activity, and a homemade recipe adds its own rules. A separate page on what do dogs need in their diet covers portions, changes with age, homemade food and the 7-7-7 rule in one place, so read it before you change your dog’s food.

What are the signs a diet is missing something?

These signs have many causes, so ask your vet first:

• A dull coat, dry skin or itching
• Weight loss or gain without a change in food
• Low energy
• Poor appetite
• Recurring digestive upsets

Don’t add supplements to guess at the cause. A vet can examine the dog and review the diet.

Essential nutrients for dogs: your questions answered

Five Steps to Cover the Essentials This Week

1. Verify “Complete” Status: Check your dog’s food packaging to ensure it says “Complete” and specifies their current life stage.
2. Ensure Continuous Hydration: Keep fresh drinking water accessible 24/7 and refill the bowl multiple times daily.
3. Avoid Unnecessary Supplementation: Skip extra calcium powders or synthetic multivitamins unless explicitly prescribed by a vet.
4. Weigh Ingredients for Home Cooking: If preparing homemade meals, weigh every single ingredient in grams using a vet-approved nutritionist recipe.
5. Monitor Nutritional Health: Schedule a vet visit if you notice signs of deficiency like a dull coat, poor appetite, or unexplained weight changes.

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