Dog Supplements UK: What's Actually Worth Giving Your Dog (and When)

Dog supplements are widely available in the UK, but not every dog needs one. A complete, balanced diet, a healthy weight, regular exercise and routine veterinary care usually provide the strongest foundation for good health.

Supplements can still be useful for specific needs. Joint support, omega-3 oils, probiotics and calming products may help some dogs when chosen carefully. The important point is to match the supplement to the dog and the reason for using it.

This guide explains what may be worth considering, what is often unnecessary, and when a vet should be involved.

Important: Supplements are not a substitute for veterinary advice, diagnosis or prescribed treatment. Speak to your vet before starting a supplement if your dog has a health condition, takes medication, is pregnant, or is showing new or worsening symptoms.

Start with the diet

Before adding anything, check what your dog is already eating. A good-quality complete dog food should provide the vitamins and minerals needed for your dog’s life stage.

This applies whether you feed raw, wet or dry food. “Natural” does not automatically mean complete, so check the packaging carefully. If you feed a complementary food or prepare meals at home, ask your vet or a qualified canine nutritionist whether the overall diet is balanced.

We supply raw dog food, wet food, natural treats and dry recipes, including high-meat and grain-free options. Our Riker’s Recipe Superfood 65 range contains 65% meat and is available with British free-range chicken, Angus beef or Scottish salmon.

A supplement should have a clear purpose. It should not be added simply because a product promises “complete wellness” in vague terms.

Joint supplements for older and larger dogs

Joint support is one of the more common reasons owners look for dog supplements in the UK. It may be worth discussing with your vet if your dog is older, a large or giant breed, highly active, has had a previous joint injury, or is showing signs of stiffness.

Common ingredients include:

• Glucosamine, which supports cartilage and joint structure.
• Chondroitin, which helps support the cartilage’s cushioning properties.
• Green-lipped mussel, a natural source of marine omega-3 fatty acids.
• Turmeric, which is included in some products for its potential anti-inflammatory properties.
• MSM, hyaluronic acid and omega-3, which may also appear in joint formulas.

The evidence and results vary between dogs. A joint supplement may support comfort and movement, but it will not correct every cause of lameness or pain. Weight management, sensible exercise and veterinary treatment are often just as important.

Cold, damp weather can make stiffness more noticeable. During autumn and winter, look for changes such as taking longer to stand up, hesitating on stairs, walking less far or seeming uncomfortable after resting. These signs should be discussed with a vet rather than treated with a supplement alone.

The PDSA guidance on joint supplements explains that they may be suitable for some older, arthritic, working or at-risk dogs, but not every dog will benefit.

Omega-3 for skin, coat and joint support

Fish oils, including salmon oil, are often used to support a dry, dull or itchy coat. Marine omega-3 fatty acids such as EPA and DHA may also support joint health.

An omega-3 supplement may be worth considering when your dog has:

• A dry or dull-looking coat.
• Mild skin irritation, alongside veterinary advice.
• A diet that is not already rich in marine omega-3.
• Joint support needs identified by a vet.

Choose a dog-specific product with clear information about the amount of EPA and DHA. “Fish oil” on its own does not tell you how much active omega-3 the product provides.

Do not add several oils or joint products together without checking the combined dose. Too much can cause digestive upset and may not be suitable for dogs with pancreatitis, chronic gastrointestinal problems or medicines that affect blood clotting.

If your dog has persistent itching, hair loss, sores, ear problems or a sudden change in coat condition, arrange a veterinary check. Skin problems can have many causes, including allergies, parasites and infection.

Probiotics and prebiotics for digestion

Probiotics contain beneficial bacteria. Prebiotics provide fibre or other nutrients that support the bacteria already present in the gut.

They may be useful for some dogs:

• After a mild tummy upset.
• During or after a change in diet.
• Following a course of antibiotics, if your vet recommends one.
• As part of a wider plan for a sensitive stomach.

Choose a product made for dogs and look for named strains, clear quantities and feeding instructions. Avoid assuming that human supplements or yoghurt will provide the same support.

Introduce a new product gradually and monitor your dog’s stools, appetite and behaviour. Contact your vet promptly if diarrhoea is severe, continues, contains blood, or is accompanied by vomiting, pain, weakness or a reduced appetite.

For a healthy dog eating a complete diet with no digestive problems, a daily probiotic is usually not essential.

Calming supplements before fireworks season

October is a useful time to plan for November fireworks. Calming supplements may help some dogs with mild, predictable stress, but they are not a complete solution for severe noise anxiety.

Products may contain ingredients such as L-theanine, L-tryptophan, valerian, chamomile or casein-derived compounds. The quality of evidence differs between ingredients and products.

For fireworks, supplements work best alongside practical preparation:

• Set up a quiet, familiar area before fireworks begin.
• Keep windows and curtains closed when needed.
• Use background sound to reduce sudden noise.
• Offer a familiar toy or enrichment activity.
• Start gradual desensitisation well before the event, with professional guidance where appropriate.

A dog that panics, tries to escape, becomes destructive or cannot settle may need a veterinary behaviour plan and, in some cases, prescribed medication. Do not combine several calming products without checking with your vet.

Dental, multivitamin and senior supplements

Dental supplements may include chews, powders or additives designed to support oral hygiene. They can be useful alongside regular tooth brushing, but they do not remove existing tartar or replace a dental examination.

Multivitamins are not usually needed for a healthy dog eating a complete food. Adding extra vitamins, particularly fat-soluble vitamins, can be unnecessary or harmful if the total amount becomes too high. Use them only when a vet has identified a reason.

Senior supplements often combine joint ingredients, antioxidants, omega-3 and other nutrients. They may be convenient, but check the label carefully. A senior product is not automatically suitable for every older dog, especially if your dog has kidney, liver, heart or digestive problems.

When a supplement is not necessary

A supplement may not be useful when:

• Your dog is healthy and eating a complete, balanced diet.
• There is no specific concern to address.
• Several products duplicate the same ingredients.
• The product makes broad claims without explaining the amounts provided.
• You are using it to delay a veterinary appointment.

A supplement cannot diagnose the cause of stiffness, itching, diarrhoea, weight loss, tiredness or behavioural change. If a problem is persistent, painful or getting worse, your vet should be the next step.

How to choose a dog supplement

Use this checklist before buying:

1. Check the label. Look for full ingredient quantities, serving sizes and clear feeding instructions.
2. Look for named ingredients. Avoid vague “proprietary blends” that do not state how much of each active ingredient is included.
3. Choose a dog-specific product. Human supplements may contain unsuitable doses or ingredients.
4. Check the source. A UK-made product can be useful, but the most important point is that the manufacturer clearly specifies what is inside and who the product is for.
5. Check suitability. Look for guidance by age, body weight and breed size. Check specific advice for puppies, pregnant or nursing dogs.
6. Review medication and health conditions. Ask your vet before using supplements with prescribed medicines.
7. Avoid unnecessary stacking. One targeted product is usually easier to assess than several overlapping products.
8. Consider calories. Chews and oils contribute to daily intake, which matters for dogs that need to lose weight.

Introduce supplements slowly

Follow the product’s instructions and introduce it gradually where possible. This can reduce the chance of loose stools or refusal.

Keep a simple record of:

• The product and daily amount.
• Your dog’s weight.
• Mobility, coat condition, stools or behaviour.
• Any side effects.
• Changes in other food or medication.

Do not expect a clear result in a few days. Joint and coat support commonly need several weeks of consistent use before you can assess whether they are helping. Probiotics may have a shorter timescale, depending on the reason for use. If there is no clear improvement after the recommended trial period, review the product with your vet rather than continuing indefinitely.

Dog supplements UK: frequently asked questions

Can I give my dog supplements every day?

Some dog supplements are designed for daily use, but suitability depends on the product and your dog. Follow the label and ask your vet if your dog has a medical condition or takes medication.

Are supplements needed with natural dog food in the UK?

Not usually if the food is complete and appropriate for your dog. Raw, wet or dry food should be checked to confirm whether it is complete or complementary. Natural food alone does not guarantee that extra vitamins are needed.

How long do dog joint supplements take to work?

Allow several weeks of consistent use before assessing mobility. Your vet may suggest a longer trial, particularly for an older dog or one with arthritis. Sudden pain or lameness needs veterinary attention.

Can I give my dog human fish oil or vitamins?

It is safer to choose a product made for dogs. Human products may have unsuitable doses or additional ingredients. Ask your vet before giving any human supplement.

We stock pet supplements in store and online alongside our raw, natural, wet and dry food ranges. Our team can provide practical product information, but supplements should always be used responsibly and veterinary advice should come first.

🚚 Free local delivery with no minimum order is available in Ringwood, Fordingbridge, Verwood, Alderholt and Three Legged Cross.

🚚 Free 48-hour delivery on orders over £54.99 is available across England and Wales, excluding horse and farm feeds.

For product questions, visit our dog range, read more about Riker’s, or contact us.