Why Vitamins and Minerals Are So Important for Your Dog

Vitamins and minerals are known as micronutrients. This means your dog needs them in small amounts, but without them, key processes in the body don't run reliably. Vitamins act as “helper substances” that control many enzymatic reactions, while minerals are, among other things, building blocks for bones and teeth and regulate nerve and muscle function. If the supply is consistently inadequate over time, this can show up in many areas: energy levels, digestion, coat quality, susceptibility to infection or performance. The tricky thing is that signs of deficiency often start out non-specific and develop gradually.

At the same time, “more” is not automatically better. Some vitamins, particularly the fat-soluble ones such as A, D, E and K, can build up in the body if you overdose them. Minerals, too, can cause problems if dosed incorrectly, for example if the calcium-to-phosphorus ratio is off. A good nutrient supply is therefore less a matter of chance and more the result of a stable feeding concept. If you feed a high-quality complete food, the basics are covered in most cases. Challenges often arise from highly inconsistent feeding, too many treats, independent supplementation without a plan, or permanently feeding “home-assembled” meals without a professionally calculated ration.

Another reason why micronutrients matter is life stage. Puppies need different amounts and ratios than seniors. Pregnant and lactating bitches have significantly increased needs. Athletic, active dogs use more energy, and depending on the amount of food given, the absolute intake of micronutrients also changes. If you reduce the amount of food because your dog needs to lose weight, it can theoretically happen that, with an unsuitable food, micronutrient intake drops as well. This is exactly where conscious management helps: you plan the ration, quality and treats so that your dog remains reliably supplied.

The goal isn't to memorise every single figure. It's about knowing the typical risks, being able to interpret signs of deficiency, and assessing food quality in a way that lets you feed safely in the long term. That's exactly what the following sections will give you clear guidance on.

An Overview of the Most Important Vitamins for Dogs

Vitamins can broadly be divided into fat-soluble and water-soluble vitamins. Fat-soluble vitamins (A, D, E, K) are stored in the body and should not be supplemented without proper control. Water-soluble vitamins (B vitamins and vitamin C) are stored to a lesser extent, and excesses tend to be excreted, but even here targeted supplementation makes more sense than giving them “just in case”.

Vitamin A is important for eyesight, skin and mucous membranes. It also plays a role in growth and immune function. A deficiency can show up as skin and coat problems, among other things, but overdosing is also possible if too much liver or highly concentrated supplements are given.

Vitamin D is central to calcium and phosphorus balance, and therefore to bones and teeth. Particular caution is needed here, because vitamin D can be overdosed. In dogs, vitamin D is mainly a dietary matter, not a “sunshine” issue as it is in humans. For this reason, you shouldn't give high doses on your own initiative, but should work with a vet or nutrition advisor if you suspect a problem.

Vitamin E acts as an antioxidant and supports cell protection and the immune system. It also plays a role in muscle function. Vitamin E can become relevant particularly when diets are changed or very fat-rich components are used, if the overall diet isn't balanced.

Vitamin K is important for blood clotting. In normal feeding, a deficiency is rare, but in the case of certain illnesses or medications, the supply can become more relevant. This is something that belongs under veterinary supervision.

B vitamins (such as B1, B2, B6, B12, niacin, folic acid and biotin) are crucial for nerve function, energy metabolism and protein metabolism. A deficiency can show up as tiredness, poor feed conversion, skin problems or neurological abnormalities, among other things. In practice, B-vitamin issues tend to arise more often with unbalanced home-cooked rations or with certain illnesses.

Dogs can generally produce vitamin C themselves. Even so, it can play a supportive role in special situations (stress, illness), although the evidence and the benefit vary from case to case. If you want to supplement it, professional guidance is worthwhile rather than giving it continuously “just to be safe”.

For your everyday routine, the key point is this: with a high-quality complete food, vitamin supply is normally covered. Risks arise from uncontrolled supplementation, extreme one-sidedness or permanently “mixing” things without a plan.

Essential Minerals: What Your Four-Legged Friend Really Needs

Minerals can be divided into macrominerals and trace elements. Your dog needs macrominerals in larger amounts; these include calcium, phosphorus, magnesium, sodium, potassium and chloride. Trace elements include, for example, iron, zinc, copper, manganese, iodine and selenium. Both groups are essential, and for both: it's not just the amount that counts, but often the ratio too.

Calcium and phosphorus are the classic example, because they influence bones, teeth and many metabolic processes. The ratio is particularly crucial during growth. An imbalance can cause problems in the long term. With home-cooked rations too, this is often the biggest mistake, because meat is rich in phosphorus, while calcium has to be added deliberately. If you go “by feel” here, the risk is high.

Magnesium supports muscles and nerves and plays a role in energy metabolism. Sodium and potassium regulate fluid balance and nerve signal transmission. A deficiency is rare with normal feeding, but can become relevant in the case of illness, severe diarrhoea or certain diets. In that case, assessment belongs in the hands of a vet.

Among the trace elements, zinc is often the focus because it's important for skin, coat and immune function. Iron is crucial for blood formation and oxygen supply. Iodine plays a role for the thyroid. Selenium is part of antioxidant systems, and overdosing is possible, which is why you shouldn't supplement it without proper control. Copper and manganese are relevant for various enzymatic processes, but here too, too much can be problematic in individual cases.

For your everyday routine, the key message is: a good complete food contains these minerals in a well-balanced form. The biggest risks arise when you give a lot of treats, reduce the amount of food substantially, or add mineral mixes on your own initiative without knowing what's already in the food. If you want to supplement minerals, you need a specific reason, a clear dosage and, ideally, professional guidance.

How to Recognise and Meet Your Dog's Nutrient Requirements

You can't identify nutrient requirements from tables alone, but rather through the interplay of life stage, activity, body condition and feeding method. A growing puppy has different needs to an adult dog, and an athletic dog has different needs to a calm one. Body condition also plays a role: if your dog is gaining or losing weight, the energy intake isn't right. And if you change the amount of food, the absolute intake of micronutrients can change too. This is why it helps to be able to roughly estimate energy requirements and control the amount of food in a deliberate way.

In practice, the most reliable way to meet requirements is with a high-quality complete food suited to the relevant life stage. “Complete food” means the food is formulated so that, at the right feeding amount, your dog is supplied with all the important nutrients as a matter of course. If, on the other hand, you cook very often yourself, mix things a lot, or give many supplements, the complexity increases. In that case, you need either a great deal of knowledge or a calculated ration to keep the supply stable.

One important step is to take a realistic look at the proportion of treats and “extras”. If your dog gets a lot of treats every day, this can crowd out the main food allowance. This reduces the intake of the micronutrients contained in the complete food, while calories can rise at the same time. You can avoid this by planning treats as part of the daily ration, or by using some of the main food as a reward.

If you suspect a deficiency, you shouldn't supplement “blindly”. Many symptoms are non-specific, and the wrong supplement can do more harm than good. The sensible approach is: observe the progress, check the feeding, get it checked by a vet if necessary, and correct it in a targeted way. This way, you meet your dog's needs responsibly and avoid typical mistakes.

Natural Sources of Vitamins and Minerals in Dog Food

Natural sources generally make sense, but they don't automatically replace a balanced ration. Meat provides high-quality protein and various B vitamins as well as minerals such as phosphorus and iron. Offal can provide vitamin A (liver) and other micronutrients, but shouldn't be fed in an uncontrolled way or in large amounts every day, due to the risk of overdosing and tolerance issues.

Fish can provide vitamin D and omega-3 fatty acids, but here too the amount and quality are crucial. Eggs provide high-quality protein and micronutrients, but can be poorly tolerated by sensitive dogs. Vegetables and certain types of fruit can contribute plant compounds and fibre, but they are not the “main source” of minerals in a dog's ration. Their benefit often lies in supporting digestion and adding variety, not in covering all micronutrients.

Calcium is a good example of why natural sources alone are not always enough. Meat-based rations are often low in calcium. If you cook yourself, you need a suitable calcium source and a well-matched ratio to phosphorus. This is exactly why complete foods or professionally planned rations are so helpful: they take this complexity off your hands.

If you want to include natural components, the safest way is as a supplement within a stable main food, not as a permanent “self-mix” without a plan. Small, well-tolerated additions can make sense, as long as you don't lose sight of the main supply. The key point is: you want variety and naturalness, but without losing the balance.

Single-Protein and Grain-Free Food as an Optimal Nutrient Source

Single-protein and grain-free foods are often chosen when your dog is sensitive, prone to digestive problems, or when you deliberately want to shorten the ingredients list. Single-protein means that one animal protein source is at the centre of the recipe. This can help you manage tolerance better, especially if you suspect an allergy or if your dog reacts to changing proteins.

Grain-free can make sense if your dog doesn't tolerate certain types of grain well, or if you want to reduce starchy recipes. It's important to note: grain-free is not a blanket indicator of quality. What always matters is the overall formula, digestibility and nutrient coverage. A grain-free food can be very high quality, but it can also be unbalanced if it's poorly formulated or if alternative carbohydrates haven't been chosen sensibly.

For micronutrient supply, the label is less important than the question: is this a balanced complete food with a clear, traceable declaration and suitable analytical values? If so, single-protein or grain-free can be a good strategy to ease the strain on the gut and reduce irritating factors, without putting the nutrient supply at risk.

Make sure you don't give lots of extras at the same time that undermine the concept again. A single-protein main food achieves little if you feed treats with various protein sources every day. If you use these concepts, it's best to do so consistently: few protein sources, a clear routine, controlled treats and a food formulated as a complete food.

Recognising Signs of Vitamin and Mineral Deficiency in Dogs

Signs of deficiency are often non-specific. This is why you should understand them as indicators rather than as a diagnosis. Typical signals can include: a dull coat, increased shedding, flaky skin, slow wound healing, increased susceptibility to infection, tiredness, reduced performance or recurring digestive problems. Changes in appetite or unusual behaviour can also occur. With mineral-related issues, muscle trembling, weakness or, in severe cases, neurological abnormalities can also appear.

In puppies, growth and bone problems are a particularly sensitive area. Here, an unbalanced supply of calcium, phosphorus or vitamin D can have long-term consequences. This is why you shouldn't give uncontrolled supplements during growth or put together feeding “by feel”. In seniors, absorption and metabolism can change, meaning the same ration isn't always processed in the same way. This doesn't mean a senior automatically needs supplements, but it does mean you should pay closer attention to weight, muscle mass, coat, energy and digestion.

It's important to draw a distinction: many symptoms that look like “deficiency” can also have other causes, such as parasites, allergies, hormonal disorders or chronic inflammation. If you see signs over several weeks, or if they're pronounced, a veterinary check-up is worthwhile. Giving supplements “just in case” can obscure the situation and, in the worst case, lead to overdosing.

So use a simple approach: first check the feeding (complete food? right amount? lots of treats?), then observe how things progress, then get a diagnostic check-up if needed and correct things in a targeted way. This is the safest route, because you separate out the causes instead of just masking the symptoms.

When You Should Consider Food Supplements

Food supplements can be worthwhile, but not as a standard solution. You should think about them when there's a specific reason: a confirmed deficiency, a vet's recommendation, a particular life stage (for example a lactating bitch), a targeted therapeutic measure, or a home-cooked ration that has been professionally calculated and absolutely requires certain supplements. In all these cases, “targeted” is the key word: you add exactly what's needed, in the right amount and for a limited period.

Common misguided reasons for supplementing are marketing promises, non-specific symptoms without a proper check-up, or the feeling that “a bit more can't hurt”. This can be exactly the problem with fat-soluble vitamins or trace elements. Overdosing can be harmful in the long run, and it can crowd out other nutrients in the metabolism. Combining several products also quickly leads to you losing track of the total intake.

If you feed a high-quality complete food and your dog is healthy, you generally don't need additional vitamins or minerals. If you still want to supplement, the better step is: check the food quality, optimise the feeding amount, reduce treats, and only then consider whether there's really a need. If you suspect a deficiency, a blood test or a professional ration analysis is often more sensible than trial and error.

So supplements are not a substitute for good food, but a tool for specific situations. If you use them that way, they can help. If you use them without proper control, they can create exactly the problems you were trying to avoid.

How to Correctly Assess the Quality of Dry and Wet Dog Food

You can recognise the quality of a food less by buzzwords and more by transparency, suitability and consistency. The first step is the declaration: can you tell which protein source is being used? Are the ingredients clearly named? Is there an understandable composition instead of vague collective terms? A good food should also be declared as “complete food” if it's meant to be the daily basis. Only then can you assume it's meant to fundamentally cover the nutrient supply.

The second step is choosing the right food for your dog. A puppy food should be formulated for growth, while a senior food can have different priorities. Sensitive dogs often benefit from easily digestible recipes with a manageable ingredients list. Single-protein or grain-free can be an advantage if it suits your dog, but it isn't automatically better. What matters is how well your dog tolerates the food and whether weight, stools, coat and energy stay stable.

The third step is practice: consistency, acceptance, stool quality and body condition. A food can look good on paper, but if your dog consistently has soft stools or loses or gains weight, it isn't working in everyday life. The requirement calculator in this article can also help here: if you roughly estimate the energy needs, you can plan the amount of food more realistically and avoid overfeeding.

Wet food provides more moisture, dry food is convenient to handle. Both can be high quality. For your decision, what matters is: does it suit your dog, is it transparent, is it designed as a complete food, and does it keep your dog stable? If these points are met, you have a strong foundation for reliably covering vitamins and minerals through diet.

Tips for a Balanced, Healthy Diet for Your Dog

A balanced diet comes from clear decisions and consistent implementation. The first tip is: rely on a stable foundation. A high-quality complete food, suited to your dog's life stage and tolerance, does 80 per cent of the work. The second tip is: plan treats as part of the ration. If you give a lot of treats, reduce the main food amount accordingly, or use part of the daily ration as a reward. This stops your dog from getting “too many calories, but too few micronutrients”.

The third tip is: avoid constantly switching foods. Many dogs react to frequent food changes with softer stools or an unsettled digestive system. If you do need to switch, do it slowly and in a structured way. The fourth tip is: observe your dog objectively. Weight, body shape, coat, stools and energy are the most important everyday indicators. If these are stable, it's a strong sign that your basic feeding is right.

The fifth tip is: only supplement with a reason. If you cook yourself or have specific goals, work with a calculated ration. If you suspect a deficiency, get it checked rather than supplementing blindly. And the sixth tip is: keep it simple. The simpler your feeding system, the more easily you can spot problems early and respond sensibly.

With this structure, you'll achieve more in the long run than if you're constantly trying out new products and supplements. Health doesn't come from short-term measures, but from stability.

Nandoo's Recommendation: Natural, High-Quality Products for Your Four-Legged Friend's Well-Being

If you want to keep a stable micronutrient supply in the long term, what you need above all is a reliable foundation: a high-quality food with a transparent declaration that you dose consistently and correctly. This is exactly where NANDOO comes in, with the aim of combining natural ingredients and everyday practicality so that you can build a clear feeding system. For you, that means less guesswork, more predictability and a diet that works in everyday life.

What matters is that you don't focus on individual promises, but on the overall picture: does the product suit your dog's life stage? Is it well tolerated? Do weight, stools and energy stay stable? If so, that's the foundation on which vitamins and minerals can reliably be covered through diet. You'll then only need supplements in clearly justified situations.

Nandoo's recommendation can therefore be summed up like this: rely on high-quality, natural products, stick to a clear routine, dose correctly and keep treats and extras under control. This way, you support your dog's health not just in the short term, but permanently.

Conclusion: How to Responsibly Look After Your Dog's Health

Vitamins and minerals are essential, but they don't have to be complicated. If you feed a high-quality complete food, control the amount appropriately and plan treats sensibly, the basic supply is reliably covered in most cases. Risks arise mainly from uncontrolled supplementing, extreme one-sidedness, or a feeding system with too many changing components.

If you suspect signs of deficiency, the best approach is a structured one: check the feeding, observe how things progress, get it checked by a vet if needed, and then correct it in a targeted way. Supplements are a tool for specific situations, not the standard solution. With a stable routine, transparent food quality and a clear eye on weight, stools, coat and energy, you look after your dog's health responsibly.

Simple Requirement Calculator: Your Dog's Energy Needs

This calculator gives you a rough guide to daily energy requirements (calories). It does not replace individual advice or a veterinary assessment. Factors such as age, neuter status, state of health, breed, temperature, amount of exercise and medication can change requirements.

FAQ: Frequently Asked Questions About Vitamins and Minerals in Dogs

Does your dog need extra vitamins if you feed a good complete food?

In most cases, you don't need extra vitamins if you feed a high-quality complete food and the feeding amount matches your dog's energy needs. Complete food is designed to fundamentally cover the supply of vitamins and minerals. Problems tend to arise when you give a lot of treats and thereby substantially reduce the main food amount, or when you combine several supplement products without proper control. If your dog is stable, meaning weight, stools, coat and energy level are all fine, that's a strong sign the basic supply is working. If you're still unsure, it makes more sense to check the ration and the amount of treats than to supplement “just in case”. If there's a specific suspicion of deficiency, or during particular life stages (growth, illness, lactation), the decision on supplements should be targeted and ideally made with veterinary or nutritional guidance.

Which signs of deficiency should you take seriously without supplementing yourself straight away?

Typical warning signs can include a dull coat, skin problems, increased shedding, slow wound healing, unusual tiredness, reduced performance, increased susceptibility to infection or recurring digestive problems. It's important to note that these signs are non-specific. They can point to a vitamin or mineral problem, but equally to parasites, allergies, hormonal disorders or chronic inflammation. This is exactly why “blind” supplementing is often not a good idea. If you see such changes over several weeks, or if they're pronounced, you should critically review the feeding (complete food, amount, treats, frequent changes) and get it checked by a vet if needed. Targeted diagnostics and a clear feeding strategy are safer than trial and error. This also helps you avoid overdosing, which can be particularly problematic with fat-soluble vitamins or trace elements.

Why are calcium and phosphorus so important, especially in puppies?

Calcium and phosphorus are key building blocks for bones and teeth and influence many metabolic processes. Especially during growth, it's not just the amount that matters, but also the ratio between the two minerals. If this ratio is wrong for an extended period, it can negatively affect bone development. Typical risks arise when you cook yourself and put the ration together “by feel”. Meat is rich in phosphorus, so calcium has to be added deliberately and in the right amount. Highly concentrated supplements can also be problematic, because too much disrupts the balance just as much as too little. For puppies, a suitable puppy food declared as a complete food is therefore usually the safest route, because it's formulated for growth. If you want an individual ration, it should be professionally calculated. This ensures that bones and growth aren't put at risk by well-meant but unbalanced decisions.

When are food supplements really worthwhile?

Supplements are worthwhile when there's a clear reason: a confirmed deficiency, a vet's recommendation, a special medical situation, or a home-cooked ration that has been professionally calculated and absolutely requires certain supplements. Particular life stages such as pregnancy or lactation can also change requirements, though here too a targeted choice is more important than “more is better”. Uncontrolled supplementing can cause problems, because some vitamins (A, D, E, K) are stored and can build up in the body. Trace elements such as selenium or iodine shouldn't be supplemented without a plan either. If you think your dog needs “more”, the better first step is usually: check the food quality, reduce the amount of treats, adjust the feeding amount and observe the symptoms. If a suspicion still remains after that, a veterinary check-up or a ration analysis is the safe route to a targeted supplement.

How can you use the requirement calculator to better manage feeding and micronutrient supply?

The requirement calculator mainly helps you realistically estimate the amount of energy needed. If you know roughly how many calories your dog needs per day, you can plan the amount of food more effectively and avoid overfeeding. This matters not only for weight, but also indirectly for micronutrients: if you reduce the main food amount too much, because you're giving too many treats or underestimating the calories, your dog can absorb less of the vitamins and minerals contained in the complete food. Conversely, too high an energy intake often means your dog gains weight, which puts strain on the joints and metabolism. Use the calculator as a starting point, not as a rigid rule. Observe body shape, weight, stools and energy over several weeks and gradually adjust the overall ration. If you consistently factor treats into the daily ration, the supply stays more stable and you get a feeding system that works reliably in everyday life.