As our dogs and cats grow older, their bodies change in ways that aren’t always immediately visible. A dog who used to bound up the stairs may hesitate at the bottom. A cat who once leapt to the windowsill without a second thought may now take a longer route. These subtle shifts are part of ageing — but that doesn’t mean we simply accept them.
One of the most impactful things you can do for a senior pet is to evaluate whether their nutrition is keeping pace with their changing needs. And that’s where supplements come in.
When Is a Pet Considered “Senior”?
The answer varies by species and size:
- Cats are generally considered senior from around 7–10 years of age.
- Small dogs (under 10 kg) typically enter their senior years at around 10–12 years.
- Large and giant breed dogs age faster and may be considered senior from as young as 6–7 years.
Regardless of breed, once your pet enters their senior years, their nutritional requirements begin to shift and a standard adult diet or no supplementation at all may leave some important gaps.
Why Do Senior Pets Need Extra Support?
Just like with ourselves, ageing in pets brings a cascade of changes at the cellular level that affect virtually every system in the body:
Joints and Mobility: Cartilage thins, synovial fluid decreases, and inflammation increases. This is one of the most common, and most visible, signs of ageing in both dogs and cats. Arthritis affects a significant proportion of pets over seven years old, and many owners don’t realise it until the condition is quite advanced.
Cognitive Function: Older pets can experience something similar to dementia in humans, known as Cognitive Dysfunction Syndrome (CDS). Signs include disorientation, changes in sleep patterns, decreased interaction, and forgetting previously learned behaviours.
Immune Function: As pets age, their immune systems become less efficient at responding to threats. Antioxidants and certain fatty acids can play a role in supporting immunity in older animals.
Skin and Coat Health: Senior pets often develop dryer, less lustrous coats, and their skin becomes more prone to irritation.
Gut Health: Digestive efficiency declines with age. Probiotics and easily digestible nutrients become increasingly important.
Stress and Behavioural Changes: Environmental changes, pain, or simply the neurological shifts of ageing can cause increased anxiety in older pets, particularly cats.
The Key Supplement Categories for Senior Pets
1. Joint Supplements
This is arguably the most important category for senior pets. Key ingredients to look for include:
- Glucosamine — a building block of cartilage, helps maintain joint structure.
- Chondroitin — works alongside glucosamine to reduce cartilage breakdown.
- MSM (Methylsulfonylmethane) — an anti-inflammatory compound that reduces joint pain.
- Green-Lipped Mussel — a New Zealand marine ingredient rich in omega-3 fatty acids and natural chondroitin.
- Omega-3 fatty acids (EPA & DHA) — anti-inflammatory and protective of joint tissue.
Joint Supplements available at Pet Chemist:
Antinol Plus is a premium omega-rich formula containing PCSO-524®, derived from sustainably farmed New Zealand green-lipped mussels. It delivers over 90 fatty acids including EPA, DHA, and DPA, and has been clinically shown to improve joint mobility in cats. The easy-feed capsule format can be opened and sprinkled over food.
4CYTE Canine Joint Support is one of Australia’s most highly regarded joint supplements for dogs, featuring Epiitalis — a plant-based extract with clinically supported evidence for cartilage regeneration and joint protection. It’s available as a gel or granules that mix easily into food, making daily dosing straightforward.
PAW Osteocare Joint Protect Chews for Dogs combines 500mg of glucosamine sulfate, 250mg of chondroitin, MSM, and a balanced blend of vitamins and minerals. The tasty kangaroo-based chew is ideal for dogs who are finicky about taking supplements — many consider them a treat!
2. Omega-3 Fatty Acids (Fish Oil)
Omega-3s are among the most versatile supplements for senior pets. They support joint health, cognitive function, cardiovascular health, skin and coat condition, and immune function — all areas of particular importance as pets age.
Research has shown that supplementing older pets with fish oil — specifically DHA and EPA — can improve comfort and mobility in arthritic animals, and may even support cognitive health in dogs showing early signs of Cognitive Dysfunction Syndrome.
Supplements for cognitive support available at Pet Chemist:
Value Plus Omega 3 + 6 + 9 Oil and other omega oils available at Pet Chemist can be easily added to wet or dry food. For a more targeted approach, Antinol products (listed above under joint supplements) also deliver a highly bioavailable omega-3 complex.
3. Calming and Behavioural Support
Older pets, particularly senior cats, are often more sensitive to stress. Changes in routine, veterinary visits, new pets, or household disruptions can trigger anxiety that, in younger years, would have been easily shrugged off.
Supplements for behavioural support available at Pet Chemist:
Zylkene Capsules contain hydrolyzed milk protein (alpha-casozepine), a naturally derived compound that supports a calm and relaxed state without causing drowsiness or sedation. It’s available for both dogs and cats, and the powder inside the capsule can be sprinkled directly on food. Zylkene is backed by clinical research and is a trusted choice recommended by veterinarians for managing anxiety in senior pets — whether for day-to-day stress or specific events like travel or changes in the household.
4. Skin, Coat and General Wellness
Senior pets often benefit from broader nutritional support that goes beyond a single system. Omega-3 and omega-6 fatty acids remain central here, as does vitamin E and antioxidants.
For dogs especially, an omega oil blend such as those available in Pet Chemist’s omega-3 supplement range can visibly improve coat quality and reduce skin dryness within weeks of consistent use.
Dogs vs. Cats: Key Differences to Keep in Mind
Cats are not small dogs. They have distinct metabolic needs, and some ingredients that are safe and beneficial for dogs can be harmful to cats — so always choose supplements formulated specifically for the species.
Cats are also notoriously resistant to taking anything in tablet or capsule form. Powder supplements that mix into food, or soft gel capsules that can be opened and sprinkled over wet food, tend to be far more practical.
Dogs are generally more amenable to chewable or flavoured supplements, and the range of formats available for them is broader. Flavours like kangaroo, chicken, and beef are common in chew-based products and are typically very well accepted.
Do All Senior Pets Need Supplements?
Not necessarily. A pet eating a high-quality, life-stage-appropriate diet may already be getting adequate levels of some nutrients. However, given the specific demands of ageing – particularly around joints, cognition, and immunity – supplementation is often a sensible, proactive step.
The most important thing is to speak with your veterinarian before starting any new supplement, especially if your pet has existing health conditions or is on medication. Some supplements can interact with medications, and a vet can help you prioritise what will be most beneficial for your individual animal.
Final Thoughts
A few years ago, keeping a senior pet comfortable and healthy relied largely on pain medication and reactive veterinary care. Today, the range of high-quality preventative supplements available means we can take a much more proactive approach — slowing the progression of common conditions and supporting our pets’ quality of life well into their golden years.
Whether it’s keeping your 10-year-old Labrador moving freely on morning walks, helping your elderly cat stay calm and comfortable, or simply maintaining the coat and energy of an ageing pet, supplements offer real, evidence-backed support.
Explore the full range of senior pet supplements at petchemist.com.au — and as always, consult with your veterinarian to find the right combination for your individual pet.
