If your social feed is anything like the average Aussie pet owner’s, it’s probably full of gut-health powders, collagen chews and fish-oil pumps promising a shinier coat and a longer life. New Australian research released this year found that nearly two-thirds of local cat and dog owners had added a supplement to their pet’s diet over the previous 12 months, and more than half admitted to trying a wellness trend on their pet simply because they were following it themselves.
That enthusiasm is understandable — we want our animals to thrive. But feeding your dog or cat a cupboard full of pills isn’t the same as feeding them well. Here’s a practical, vet-informed look at which pet supplements are actually worth it, which are mostly marketing, and how to use them safely.
Why supplements are booming in Aussie homes
A few things are driving the trend. The humanisation of pets means we increasingly reach for the same wellness products we use ourselves. Winter also plays a part: as the weather cools and routines shift indoors, many owners look for a supplement to “top up” a pet that seems a bit flat, stiff or unsettled. And the sheer volume of online marketing makes it easy to assume every healthy dog or cat needs a daily scoop of something.
The catch is that a complete, balanced commercial pet food is already formulated to meet a healthy animal’s nutritional needs. For most pets eating a reputable diet, a general multivitamin adds little — and occasionally does harm.
The supplements with the best evidence
Not all supplements are created equal. A handful have genuine research behind them when used for the right pet at the right dose:
- Marine omega-3s (EPA and DHA): Fish-oil-derived omega-3s are among the best-supported supplements. At adequate doses they can help reduce inflammation and are commonly used to support skin, coat and joint comfort.
- Joint support (glucosamine, chondroitin, green-lipped mussel): These show reasonably consistent benefit for older dogs and large breeds prone to arthritis, and are often recommended as part of a broader joint-care plan.
- Probiotics: Evidence is more mixed, but specific strains may help settle short-term digestive upsets such as stress-related diarrhoea. Look for products with named strains rather than vague “good bacteria” claims.
- Targeted deficiencies: Pets on home-cooked or unbalanced diets can genuinely need added nutrients — but this should be guided by a vet, not guesswork.
Where owners go wrong: stacking and overdosing
The biggest risk isn’t a single supplement — it’s several at once. A common stack of a multivitamin, a joint chew, a fish-oil pump and a probiotic can quietly push certain nutrients over safe limits. Fat-soluble vitamins such as A and D are a particular concern, because the body stores rather than flushes the excess, and too much can make a pet unwell.
It’s also worth remembering that complementary pet products aren’t regulated as tightly as prescription medicines, so quality and dosing can vary between brands. More is not better, and “natural” doesn’t automatically mean safe.
What about cats?
Cats are not small dogs, and this matters a great deal with supplements. Their livers process some compounds differently, and ingredients that are fine for dogs — or people — can be risky for a cat. Many cats also simply won’t tolerate powders or oils hidden in food. If you’re considering anything for a cat, from a joint aid to a calming chew, run it past your vet first and never assume a dog product can be halved and shared.
How to choose a supplement wisely
- Ask your vet before starting anything, and bring a list of everything your pet already takes.
- Choose products formulated specifically for the species — dog or cat, not “pet”.
- Prefer brands that name their active ingredients and doses, and ideally involve veterinary formulation.
- Start one product at a time so you can tell whether it’s actually helping.
- Watch for changes in appetite, energy or toilet habits, and stop if something seems off.
The bottom line
Supplements can play a real role — particularly omega-3s and joint support for older or arthritic pets — but they work best as a targeted tool, not a daily habit copied from a human wellness routine. The foundation of a healthy dog or cat is still a complete, balanced diet, fresh water, exercise and regular check-ups. Consult a licensed veterinarian for advice on diagnosis or treatment specific to your pet before adding any supplement.
Frequently asked questions
Do healthy dogs and cats need supplements?
Usually not. A pet eating a complete, balanced commercial diet already gets the nutrients it needs. Supplements are most useful for specific situations — such as joint support in older animals — rather than as a routine add-on for a healthy pet.
Is fish oil safe for both dogs and cats?
Marine omega-3s are generally well tolerated by both when given at an appropriate dose, and are commonly used to support skin, coat and joint health. Doses differ between species and sizes, so check with your vet rather than guessing.
Can I give my pet human supplements?
It’s not recommended. Human products can contain doses or ingredients that are unsafe for animals — and some are toxic to cats in particular. Always use pet-specific products and confirm with your vet.
How do I know if a supplement is working?
Introduce one product at a time and watch for real changes over a few weeks — better mobility, a calmer stomach or an improved coat. If you notice no benefit, or any side effects, stop and speak to your vet.
Key takeaways
- Most healthy pets on a balanced diet don’t need routine supplements.
- Omega-3s and joint support have the strongest evidence, mainly for older or arthritic pets.
- Stacking multiple products can push nutrients past safe limits — vitamins A and D especially.
- Cats process ingredients differently and need species-specific, vet-approved products.
- Always talk to your vet before starting, and introduce one supplement at a time.
