Vitamin pills, relevant to what vitamins a dog should have daily
on August 23, 2026

What Vitamins Should a Dog Have Daily?

Short answer: dogs need vitamins A, D, E, K and the B-complex group from their food every day. But whether your dog needs a daily supplement depends on their diet, age and health, and for most dogs on a complete food the answer is "not necessarily". If you've ever stood in the pet aisle wondering what vitamins should my dog actually have daily?, you're not alone. Our 10-in-1 Multivitamin Chews cover the essentials in one daily chew, but let's first break down which vitamins matter, whether your dog needs extra at all, and how to choose safely.

Table of Contents

Does My Dog Need Vitamins Every Day?

Yes, every dog needs vitamins daily. The real question is where they come from. In the UK, any dog food labelled "complete" must meet the FEDIAF nutritional guidelines, which set minimum and maximum levels for every vitamin and mineral at each life stage. If your dog eats a complete food, their core vitamin needs are already being met by their dinner. That's an honest starting point: a daily supplement isn't automatically necessary for every dog, and PetMD says the same about dogs on a complete life-stage diet.

That said, certain dogs benefit more from extra support: seniors, dogs on a home-cooked diet (which is where vets most often see genuine gaps, covered in detail below), fussy eaters who leave half their bowl, and dogs with specific needs around joints, skin or digestion. If any of that sounds like your dog, a daily multivitamin can help fill real gaps rather than just being an extra add-on. If your dog's needs lean more toward digestion, read our guide on whether a probiotic or a multivitamin is the better fit. Still not sure if your dog's situation calls for a multivitamin at all? Our checklist on how to know if your dog needs vitamins separates genuine reasons from signs that need a vet first.

Doggy Dailies 10-in-1 Multivitamin Chews jar

The Key Vitamins Dogs Need

These are the vitamins dogs cannot make themselves and must get from food (or a supplement) every day:

  • Vitamin A — supports eyesight, immune function and skin health
  • B-Complex Vitamins (B1 thiamine, B2 riboflavin, B3 niacin, B5 pantothenic acid, B6, B12, folate) — support energy metabolism and nervous-system health
  • Vitamin D — regulates calcium and phosphorus for strong bones and teeth. Unlike humans, dogs can't make meaningful amounts from sunlight, so it has to come from their diet
  • Vitamin E — an antioxidant that protects body tissues
  • Vitamin K — essential for healthy blood clotting

Alongside vitamins, minerals like zinc, manganese and selenium, plus omega-3 fatty acids, also play a real role in coat, joint and immune health.

Why Home-Cooked Diets Are the Real Risk Area

This is worth spelling out with real numbers, because it's the single biggest gap vets actually see in practice. A widely-cited 2013 study in the Journal of the American Veterinary Medical Association analysed 200 published home-cooked dog food recipes and found that 95% failed to meet at least one NRC/AAFCO nutrient recommendation, with only 5 recipes (2.5%) found to be fully nutritionally adequate — and notably, all 5 of those were written by veterinarians. A far larger 2025 study from Texas A&M's veterinary school, presented at the American College of Veterinary Internal Medicine Forum, found a similar pattern at scale: roughly 25% of home-prepared diets studied were partially imbalanced, and 52% were unbalanced in 10 or more nutrients.

The most commonly missing or imbalanced nutrients across these studies were calcium, vitamin D, zinc, copper and essential fatty acids. Calcium deficiency is a particular concern, since a diet built mainly around meat is naturally high in phosphorus but low in calcium; over time, this imbalance can cause the body to pull calcium from bones to compensate, a condition called nutritional secondary hyperparathyroidism, associated with skeletal problems and fractures, particularly in growing puppies. This doesn't mean home cooking is inherently unsafe — it means a homemade diet genuinely needs to be formulated (ideally with input from a board-certified veterinary nutritionist) rather than assembled from a general recipe found online, and a proper vitamin-mineral premix, dosed correctly for your dog's weight, isn't an optional extra in that context. This is exactly the population where a well-formulated multivitamin does real, measurable work, rather than being a nice-to-have on top of an already-complete diet.

What About Vitamin C?

Here's something most "vitamins for dogs" articles get wrong: vitamin C isn't technically an essential vitamin for dogs. Unlike humans, dogs synthesise their own vitamin C in the liver, so a healthy dog on a normal diet won't become deficient (Purina). That doesn't make it useless: extra vitamin C acts as an antioxidant and is often included in supplements for older, very active or stressed dogs, whose demand can outstrip what the liver produces. It's a "nice to have" rather than a "must have", which is why you'll find it in our chews but never as the headline ingredient.

Can Too Many Vitamins Be Harmful?

Yes, more isn't better. Fat-soluble vitamins (A, D, E and K) are stored in the body rather than flushed out, so Hill's warns that giving too many can genuinely harm your dog over time. Excess vitamin A can cause dehydration, joint pain and blood-vessel damage (American Kennel Club), and vitamin D in high amounts is a potential toxin for dogs (PetMD). This is exactly why you should use a dog-specific product with a clear usage chart rather than guessing with human vitamins or stacking several products at once.

Always follow the usage guidance on any supplement, and speak to your vet before starting something new, especially if your dog is on medication or has an existing health condition.

Do Vitamin Needs Change With Age?

Yes. FEDIAF sets different nutrient levels for growth and for adult maintenance, because puppies need more of certain nutrients to support healthy development. Adult dogs need a steady, balanced intake. Senior dogs often benefit from extra support around joints, cognition and immunity as their needs shift. See our joint supplement guide if mobility is a concern, or our guide to supplements for older dogs.

Why a Daily Multivitamin Chew Can Help

For a simple way to support your dog's daily vitamin needs, our 10-in-1 Multivitamin Chews combine several of the nutrients above into one daily treat:

  • Vitamins A, D3, E and the B-complex group (B1, B2, B6, B12, niacin, pantothenic acid, folic acid) alongside vitamin C, zinc, manganese and selenium for immune, heart and brain support
  • Omega-3-rich krill oil and flaxseed for skin and coat condition, plus eggshell meal as a source of collagen
  • Probiotics (1 billion CFU) and pumpkin to support healthy digestion
  • Glucosamine, chondroitin and MSM to support joint mobility
  • Vet-formulated and suitable from 12 weeks old, with a clear usage chart for every size and life stage

Rather than juggling several single-purpose supplements, one daily chew covers multiple bases at once, and most dogs genuinely enjoy taking it, which makes consistency far easier.

Doggy Dailies Probiotic Chews jar, a complementary gut-health option alongside a daily multivitamin

How to Introduce a Daily Vitamin Routine

  1. Choose a quality, dog-specific product — avoid human vitamins and low-quality fillers.
  2. Give it at the same time each day, ideally alongside a meal, to build a consistent habit.
  3. Follow the usage chart for your dog's weight — don't guess the amount.
  4. Watch for changes in energy, coat condition and general wellbeing over the following weeks.
  5. Check in with your vet before starting, especially for dogs with existing health conditions or on medication.

FAQ

Is it okay for dogs to take vitamins every day?
For most healthy dogs on a balanced diet, a dog-specific multivitamin given according to its usage chart is generally fine, but always check with your vet, especially if your dog has an existing health condition.

Do multivitamins for dogs really work?
Quality, vet-formulated multivitamins can help fill nutritional gaps, particularly for seniors, fussy eaters or dogs on home-cooked diets. A dog already eating a complete, balanced food may need little additional support.

Are homemade diets really that likely to be nutritionally deficient?
Yes — a widely-cited study of 200 published recipes found 95% failed to meet at least one key nutrient recommendation, and only recipes written by vets tended to be fully adequate. A 2025 study found over half of home-prepared diets studied had 10 or more nutrient imbalances.

Do vets recommend dog vitamins?
Many vets do recommend supplements for dogs with specific needs (joints, skin, digestion, seniors, or home-cooked diets), but recommendations vary by dog, so it's always worth asking your own vet directly.

Should I give my dog vitamins every day?
If your vet has confirmed it's appropriate for your dog, daily consistency is exactly how vitamin supplements are designed to work. Occasional use has far less benefit.

Do dogs need vitamin C?
Not as an essential nutrient: dogs make their own vitamin C in the liver. Extra vitamin C can still be a useful antioxidant for older, very active or unwell dogs.

Sources

This article is for general information only and isn't a substitute for veterinary advice. Please speak to your vet before starting any new supplement, especially if your dog has an existing health condition or is on medication.

Ready to build a simple daily vitamin routine? Shop our vet-formulated 10-in-1 Multivitamin Chews — trusted by over 100,000 UK dog owners, with free UK delivery.