Why is my senior dog shaking & trembling?

It can be difficult not to overanalyse every tiny change in an ageing pup. From the odd wobble and trembling to teeth chattering, how much shaking is normal in a senior dog? While many causes of shaking in older dogs are harmless, trembling can sometimes be a symptom of pain or an underlying illness. Let’s look at how to tell whether it’s time to grab a blanket and cuddle or time to call the vet.   

Is it normal for senior dogs to shake? 

Yes. Though it’s important to understand that while it’s not always a symptom of disease, your dog also isn’t shivering for no reason. Muscle loss and age-related changes in the nervous system affect how smoothly an elderly dog’s body adapts to changes in temperature, activity levels and their surroundings. This means there are often useful clues that can help explain why your pup is trembling at any particular time. 

Common benign causes of shaking in older dogs 

As nerves, muscles and joints start to slow down and wear out, a little trembling is to be expected. But understanding why older dogs shake can make it easier to recognise when they’re trembling for other reasons. 

1. Cold or low body temperature

Older dogs have less insulating muscle and fat, and less muscle also means they naturally produce less body heat. At temperatures a younger dog might ignore, a senior dog may begin to shiver, which is the body’s built-in warming mechanism. 

2. Age-related muscle weakness 

Hind leg trembling is especially common. As dogs lose muscle mass, the remaining muscle gets weaker and fatigues more quickly. After exercise, getting up or even standing for a while, tired muscles may begin to tremble. The nerve signals reaching the muscles can also get noisier, like static, resulting in ‘patchy reception’. Read our guide to exercising older dogs.

3. Excitement or emotional arousal

During excitement, a dog’s body releases adrenaline, shifting them into a state of readiness. Heart rate can increase, and ready-to-go muscles may tremble in anticipation. In older dogs, these “I can’t wait” wiggles can become a little more exaggerated and clumsier as nerve and muscle control decline. 

4. Dreaming 

It’s normal for dogs of any age to experience muscle twitching during REM sleep. It’s also nice to think it’s a sign of a really great dream! Learn more about dogs dreaming. 

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Medical causes of shaking in senior dogs

The frustrating thing about shaking and trembling is that it can be a general sign of stress and pain. The same pathways involved in excitement can also be triggered by physical or emotional stress, such as pain or confusion caused by dementia. In a true emergency, though, it’s rare for trembling to be the only symptom, but here are a few conditions worth keeping in mind. 

1. Pain 

Dogs rarely cry out because of chronic pain, such as arthritis, and this type of pain is one of the most common treatable causes of trembling. Pain signals can increase muscle tone around inflamed joints and trigger protective muscle tremors that may be especially noticeable when rising, after rest or on cold days.

2. Neurological conditions 

There’s a difference between a dog that is alert but shaky and one that seems vacant, disoriented or unable to control their movements properly. Dragging their legs, stumbling, falling over or paddling movements can point to more significant neurological problems such as degenerative myelopathy, brain lesions or seizure activity. 

3. Generalised tremor syndrome

This condition, which can affect any dog but most commonly small, white-coated dogs, is typically seen in younger dogs. It’s caused by steroid-responsive inflammation in the cerebellum. While the main symptom is shaking, it would be unusual for an elderly dog with no previous history to suddenly develop this condition. 

4. Hypoglycaemia 

Hypoglycaemia in elderly dogs is most commonly a sign of an underlying problem, but toy breeds that struggle to maintain their bodyweight have less of a glucose buffer when they skip meals. A wobbly, spaced-out dog that improves quickly after food may be having hypoglycaemic episodes. If this happens, don’t dismiss it as something you can manage at home, see your vet to screen for underlying problems first.   

5. Hormonal disease 

Hormonal, or endocrine, diseases are common in older age. Addison’s, Cushing’s, hypothyroidism, and diabetes can all interfere with body temperature, electrolytes and glucose balance. For Cushing’s and hypothyroidism there are often other symptoms and changes happen slowly. With Addison’s and diabetes, dogs can suddenly become ill, and in these situations, trembling is accompanied by digestive upsets, changes in drinking, extreme weakness, disorientation and even seizures. 

6. Toxin ingestion 

Any inquisitive dog can get itself into trouble eating things it shouldn’t. If sudden severe shaking starts, often accompanied by other symptoms, check whether your pup has had access to any toxic plants, xylitol, or human medications and get them to the vet.

If your dog's shaking started suddenly, is severe, or is accompanied by vomiting, collapse, or loss of consciousness — contact your vet immediately.

Why is my older dog chattering their teeth? 

Teeth chattering can happen for the same reasons as trembling and shaking, like being cold or excited. But there are also a few more things to consider, including dental pain, which is frequently underdiagnosed in older dogs. When teeth chattering happens alongside drooling, head rubbing, pawing at the face or reluctance to chew on harder foods, it can point to a dental issue.

Another possibility is focal seizure activity. Unlike a full seizure, dogs may remain conscious but appear vacant or unaware of their surroundings. Repetitive jaw movements or teeth chattering can sometimes occur during these episodes. If you notice recurrent episodes, try filming them and showing the video to your vet.

How to tell if your dog is shaking from pain 

When shaking is a symptom that something is wrong, like pain, there are almost always other signs or clues you can pick up on. Body language and behaviour can speak as loudly as words. A hunched posture, reluctance to move, changes in the way they walk and either seeking interaction for comfort or avoiding it altogether can all suggest pain. Panting, whining and restlessness are more obvious, but many dogs can be quite stoic and won’t show pain in an obvious way. Read more about how to tell if your dog is in pain.

Arthritis is the leading cause of pain in elderly dogs and discussing a multi-modal approach with your vet can help minimise symptoms by using a combination of anti-inflammatories, painkillers, joint supplements and newer disease-modifying drugs. 

What to do if your senior dog is shaking 

It’s best to break down what to do by how sudden and severe the shaking is. 

Slow onset or subtle shaking

Sometimes it’s difficult to remember when you first noticed the trembling, but now it seems to be happening more often. This can be typical of age-related changes and ‘normal’ trembling, although if you haven’t been to the vet in the past few months, it’s probably time for a check-up. In many cases, though, helping an older dog feel more comfortable can be surprisingly simple. If they seem tired, let them rest. If they’re cold, make sure they have somewhere warm and comfortable to snuggle. And if they’re simply trembling with excitement, that’s good news — it means they’re still enjoying life.

Sudden onset or severe shaking

When severe, uncontrollable trembling and shaking seem to come out of the blue, and your dog looks miserable, don’t wait to see if it passes; contact your vet. If there are other symptoms like collapse, seizure-like signs, breathing changes, vomiting or diarrhoea, act straight away. In these circumstances, trembling can be a sign that something is seriously wrong; go straight to the vet. 

When in doubt, call your vet. A short phone consultation can help you decide whether to come in immediately or monitor at home.

Conclusion 

From “I can’t wait” shakes to “please tuck me in somewhere warm” trembles, shaking can often be a helpful clue to what your senior dog is feeling and experiencing. While some causes need veterinary attention, many are simply part of growing older. Understanding the difference can help you support your dog more confidently and enjoy the slower, gentler pace of their senior years, together, under a blanket on the sofa.