The Complete Guide to Senior Dog Health: What to Watch For and How to Help

Every owner of an older dog has had that moment of doubt. Your dog pants a little more than they used to, takes a second longer to get up off their bed, or starts behaving in a way that’s just slightly off — and you find yourself wondering whether it’s simply old age, or something that needs a vet.

It’s one of the hardest parts of loving a senior dog: knowing the difference between normal ageing and a genuine warning sign.

This guide is here to help. We’ll walk you through the most common changes owners notice in older dogs — panting, coughing, shaking, circling, seizures, unusual eating, mobility problems and more — explaining what’s usually harmless, what needs a routine check-up, and what counts as an emergency. Think of it as a calm, practical reference you can come back to whenever something gives you pause.

As always, this guide is for information only and isn’t a substitute for professional veterinary advice. If you’re ever worried, your vet is the right person to call.

When is a dog considered “senior”?

There’s no single birthday when a dog officially becomes a senior — it depends almost entirely on their size and breed.

Body size is the biggest factor in how a dog ages. Smaller breeds tend to live longer and age more slowly, while large and giant breeds reach their senior years much earlier. As a rough guide:

This matters because it shapes when you should start paying closer attention. A Chihuahua bouncing around at 9 is still firmly middle-aged, whereas a Great Dane of the same age is well into their senior chapter and may already benefit from extra joint and mobility support.

Knowing roughly where your dog sits on this scale helps you tell the difference between “they’re just getting older” and “this is new and worth investigating.”

Panting and breathing changes in older dogs

A bit more panting as a dog ages can be completely normal — but a sudden or unexplained change is worth a closer look.

Normal vs excessive panting

Panting is how dogs cool themselves down and burn off excitement, so panting after a walk, a game or on a warm day is exactly what you’d expect. With age, you might notice a very mild, gradual increase, and that alone usually isn’t cause for concern.

What should prompt a vet visit is panting that turns up when it has no obvious reason — at rest, overnight, or in cool weather. That’s your dog’s way of telling you something has changed.

What causes heavy panting in senior dogs?

Common causes of excessive panting in older dogs include:

• Pain or discomfort — often from arthritis or stiff joints
• Anxiety or stress — which can increase with age
• Heart or respiratory conditions
• Hormonal conditions such as Cushing’s disease
• Side effects of medication
• Carrying excess weight, which makes everything harder work
• Flat-faced (brachycephalic) breeds, who are more prone to breathing difficulties

If panting is linked to anxiety rather than a medical cause, some owners find a gentle, natural calming aid such as hemp seed oil or another calming supplement helps take the edge off everyday stress — though it’s always worth ruling out underlying health issues with your vet first.

Seek urgent veterinary help if your dog is struggling to breathe, appears distressed, has blue-tinged gums, or has collapsed. This is an emergency.

Coughing in senior dogs: what to look for

An occasional cough is rarely a problem, but a persistent or worsening cough in an older dog deserves attention — especially if it comes with faster or more laboured breathing.

Why is my senior dog coughing?

Coughing can have several causes, which is exactly why a vet examination matters. Possibilities include:

• Chronic bronchitis — long-term inflammation of the airways
• Tracheal collapse — a windpipe condition most common in small breeds like Yorkshire Terriers
• Laryngeal paralysis — seen more often in larger breeds such as Labradors
• Heart problems — fluid on the lungs or an enlarged heart pressing on the airways
• Infections — including kennel cough, pneumonia or lungworm
• Tumours — less common, but possible in older dogs

A brand-new cough, particularly alongside lethargy, breathing difficulty or weight loss, warrants prompt veterinary advice.

Shaking, trembling and teeth chattering

These three often get lumped together, but they can mean slightly different things. Let’s take them one at a time.

Why is my senior dog shaking?

Whole-body shaking — where your dog looks like they’re shivering or trembling all over — can signal that they’re cold, anxious, excited, in pain, or experiencing low blood sugar. Less commonly, neurological changes, muscle weakness or toxin exposure may be involved.

Context is everything. A quick shiver on a frosty morning is very different from sudden, violent shaking, or trembling that’s gradually becoming more frequent and intense. The latter is worth exploring with your vet.

Localised trembling and twitching

Sometimes the trembling is confined to one area, such as a single leg. This can be triggered by exercise or happen at random, and is often linked to pain (arthritis is a frequent culprit), muscle weakness or a neurological issue. Trembling around the head can occasionally indicate a focal seizure, so it’s worth flagging.

What does teeth chattering mean?

Teeth chattering in older dogs can stem from pain, dental disease or neurological changes. Some dogs also chatter their teeth when they catch an interesting scent, which is perfectly normal. But if it’s new behaviour — or it’s increasing — have it checked.

A handy tip: these behaviours are often intermittent and may not happen during the vet visit. Filming a short video on your phone gives your vet far more to work with.

Seizures in senior dogs

Watching your dog have a seizure is frightening, and it’s natural to fear the worst. While brain tumours are one possible cause, they’re far from the only one.

Any first-ever seizure, or a cluster of seizures, calls for an urgent trip to the vet.

What can cause seizures in older dogs?

• Brain tumour
• Kidney or liver disease
• Low blood sugar
• Toxin ingestion
• Severe infection or inflammation
• Idiopathic epilepsy (though this is rarely first diagnosed in old age)

What to do during a seizure

1. Stay calm and note the time it starts.
2. Reduce stimulation — dim the lights and keep noise to a minimum.
3. Clear the area of anything your dog could hurt themselves on.
4. Don’t put your hands near their mouth — dogs can’t swallow their tongues, and you risk being bitten unintentionally.
5. Time it. Anything lasting more than five minutes needs emergency veterinary help.

Afterwards, many dogs go through a “post-ictal” phase where they seem dazed, tired or disorientated for a while. If it’s a first seizure, or your dog has multiple seizures within 24 hours, get them seen straight away so your vet can investigate the cause and discuss treatment.

Circling, head tilts and balance problems

An older dog walking in circles, tilting their head or losing their footing can look genuinely alarming — and many owners immediately assume a stroke. In reality, the most common explanation is something far less frightening.

Vestibular disease

The vestibular system controls balance, with sensors in the inner ear and brain stem. When it misfires, dogs can circle in one direction, tilt their head, lose their balance, develop flickering eye movements, and feel nauseous.

It looks dramatic, but the good news is that most cases are idiopathic (no specific cause is ever found), and the majority of dogs improve markedly within 72 hours and recover fully within a couple of weeks. A vet check is still essential to rule out other problems such as an ear infection.

Canine cognitive dysfunction (doggy dementia)

The other common cause of circling in older dogs is canine cognitive dysfunction — often called “doggy dementia,” as it’s similar to Alzheimer’s in people. It’s a gradual, progressive decline in brain function, with signs including:

• Aimless circling or pacing
• Increased vocalisation, especially at night
• Confusion or staring into space
• Forgetting familiar commands or routines
• Toileting accidents indoors

While there’s no cure, many dogs do well with a combination of veterinary support, a consistent daily routine, environmental tweaks and brain-supporting nutrition. Keeping older dogs mentally and physically engaged — gentle walks, sniffing games and enrichment — can make a real difference to their quality of life.

Other causes of circling

Less commonly, circling can be linked to a brain tumour, a stroke, inflammation of the brain (encephalitis), or significant pain. Each of these tends to come with additional signs such as seizures, one-sided weakness or behavioural changes.

Call your vet urgently if circling appears suddenly for the first time, or comes alongside distress, seizures, severe lethargy or weakness on one side of the body.

Mobility and joint stiffness: the most common senior change of all

If there’s one change that defines the senior years for most dogs, it’s a gradual loss of mobility. Yet because it creeps in so slowly, it’s often the easiest to dismiss as “just getting old.”

Signs your dog’s joints may be struggling include:

• Stiffness when getting up, especially after rest
• Hesitating or refusing to jump into the car or onto the sofa
• Slowing down or lagging behind on walks
• Difficulty with stairs
• “Bunny-hopping” on the back legs
• Licking repeatedly at a particular joint
• A reluctance to be touched around the hips, knees or elbows

Stiff, achy joints are uncomfortable, and that discomfort can ripple outwards into many of the other signs in this guide — restlessness, panting, irritability and reduced appetite among them. Supporting your dog’s joints early is one of the most effective ways to keep them comfortable and active for longer.

This is where a quality joint supplement earns its place. Ingredients such as glucosamine, chondroitin, omega-3 and turmeric are widely used to support cartilage, cushioning and a healthy inflammatory response. Our Senior Dog Joint Supplement for dogs aged 8+ and easy-to-feed Senior Dog Joint Chews are formulated specifically with older dogs in mind, while Senior Max Plus offers a high-strength option for dogs aged 9+ who need that bit of extra support.

If your dog is still in their prime but you’d like to stay ahead of joint wear, starting earlier with an adult joint supplement can help lay strong foundations. You can read more about the ingredients and the thinking behind them on our How Enhanced Joint Support Works page.

Unusual eating: why is my senior dog eating dirt?

Eating dirt or other non-food items is known as pica, and it can have several underlying causes:

• Nutritional deficiency from an unbalanced diet
• Boredom or anxiety
• Cognitive decline
• Digestive discomfort, nausea or poor nutrient absorption
• Simple learned habit

If this is new behaviour, your dog needs a vet check to rule out deficiencies or digestive issues, along with a review of their diet and daily enrichment. Gut health plays a bigger role in overall wellbeing than many owners realise, and supporting digestion with a daily dog probiotic can help some dogs absorb their food more effectively — though any sudden change in eating behaviour should always be investigated first.

Other signs of ageing worth watching

Beyond the big-ticket symptoms, there’s a cluster of subtler changes that come with age. Here’s how to read them.

• Weight changes — A senior dog’s weight should stay fairly steady. Unexplained loss or gain both warrant a conversation with your vet. Our guide on why senior dogs lose weight digs into the causes and red flags in more detail.
• Increased thirst or urination — Can point to conditions such as diabetes, kidney disease or hormonal disorders, all of which are common — and manageable — in older dogs.
• Changes in sleep — Sleeping noticeably more or less than usual can reflect pain or cognitive change.
• Lumps and bumps — Very common in seniors, and most are harmless. Even so, every new lump should be checked, as some need closer attention.
• Vision or hearing loss — A gradual decline is normal; a sudden change, especially with distress, needs urgent care.
• Coat quality — A greying muzzle is part of growing old gracefully, but a dull coat, hair loss, dandruff or itchy skin is not. A natural skin and coat-supporting oil may help maintain condition alongside a good diet.
• Appetite — Older dogs should still be keen on their food. A drop in interest can signal pain, dental trouble or illness.
• Dental disease — Bad breath, heavy tartar, sore gums and loose teeth are common but never “normal,” and all need veterinary attention.

When to take your senior dog to the vet

There’s a lot to take in here, so let’s simplify it. As a general rule: symptoms that come on gradually can usually wait for a routine appointment, while anything sudden, severe or distressing needs urgent attention.

If you’re ever unsure, call your vet or out-of-hours provider. They can triage the situation over the phone and tell you whether to wait or come straight in. Trusting your instincts is rarely the wrong move — you know your dog better than anyone.

Frequently asked questions

How do I know if my old dog is in pain?
Dogs hide pain well, so the signs are often subtle: stiffness, reluctance to jump or climb stairs, slowing down, licking at a joint, changes in temperament, panting at rest, or a drop in appetite. If you suspect pain, your vet can assess your dog and recommend appropriate support.

Is heavy panting normal in senior dogs?
A mild, gradual increase can be normal with age. Panting that appears suddenly, happens at rest or overnight, or occurs in cool conditions is not, and should be checked.

At what age should I start giving my dog a joint supplement?
Many owners start a senior-specific supplement once their dog reaches their senior years (which varies by size — see the table above). Others begin earlier, in adulthood, to support joints proactively before stiffness sets in.

Can senior dog health problems be prevented?
Not all of them, but you can stack the odds in your dog’s favour. Keeping your dog at a healthy weight, maintaining gentle regular exercise, feeding a balanced diet, supporting joints and gut health, staying on top of dental care, and attending routine vet check-ups all help your dog age more comfortably.

My senior dog seems healthy — do they still need vet visits?
Yes. Routine check-ups (typically twice a year for seniors) catch problems early, when they’re easier and cheaper to manage. Many age-related conditions respond far better to early intervention.

Helping your dog age comfortably

The reassuring takeaway is this: a great many senior dog symptoms are manageable with the right support and a bit of early action. The key is paying attention, knowing what’s normal for your dog, and acting promptly when something changes — while never letting this guide replace your dog’s regular vet check-ups.

Our senior dogs have given us years of loyalty and companionship, and the senior years are our chance to return the favour. At Canine Life Co., we’re a family-run business that genuinely cares about helping active dogs stay active — with naturally formulated, UK-made supplements designed to support mobility, comfort and everyday wellbeing as your dog grows older.

You can explore our full range of senior dog supplements and bundles in the shop, or get in touch if you’d like a hand choosing the right support for your dog. We’re always happy to help.

Important health information: This article is for general information only and isn’t a substitute for professional veterinary advice. If you’re worried about your dog’s health, or think they may need emergency treatment, please contact your vet or out-of-hours provider straight away.