Why Is My Dog Shaking? Simple Signs It’s Normal or Serious

Most of the time a dog shakes because they are cold, excited, wet, dreaming or a little nervous, and the shaking stops once the cause passes. Shaking that comes with vomiting, weakness, wobbliness, pain, confusion, collapse or possible poisoning is different, and needs a vet straight away. The key is to look at what else is happening, not just at the shaking itself.

This guide gives you a calm way to sort shaking into three groups: everyday shaking, fear and stress shaking, and warning-sign shaking. It covers head shaking as a separate clue, older dogs whose back legs tremble, what to note for your vet, and the mistakes that can make things worse. It does not give any medication advice; that always comes from your vet.

At a glance

• Normal shaking has an obvious cause, such as cold, a bath, excitement or a dream, and stops when that cause stops.
• Fear and stress shaking usually comes with other body language, such as a tucked tail, lip licking, yawning or hiding.
• Go to a vet now if shaking comes with vomiting, weakness, pale gums, pain, collapse or possible toxin exposure.
• A seizure is not the same as a tremor: a dog having a seizure usually can’t respond to you. Any seizure needs a vet call.
• Frequent head shaking is often an ear problem and deserves a vet check.

Shaking, trembling, shivering and seizures: what’s the difference?

Owners use these words loosely, but vets think about them differently, and knowing which one you’re seeing helps you describe it.

• Shivering is the body’s way of making heat. It happens when a dog is cold or wet and stops as they warm up.
• Trembling or tremor is a rhythmic, repeated shaking of part or all of the body. Dogs stay fully aware and can respond to you. Veterinary neurology notes describe tremors as typically happening while a dog is awake and easing during sleep.
• A seizure is abnormal electrical activity in the brain. A dog having a generalised seizure usually falls on their side, may paddle their legs, drool, chomp, or lose control of their bladder or bowels, and can’t respond to you.
• The “shake-off” is the full-body shake dogs do after a bath, a swim, a cuddle or a tense moment. It’s normal and often a way of resetting after mild stress.

A simple test when you’re unsure: say your dog’s name softly. A shivering or trembling dog will usually look at you. A dog having a seizure usually won’t.

A calm triage table

What you see	Likely group	What to do
Shivering after a walk in cold rain, a bath or a swim	Normal (cold or wet)	Towel dry, warm room, a blanket; it should stop within minutes
Wriggly, trembling body when you come home or reach for the lead	Normal (excitement)	Nothing needed; it fades as they settle
Twitching paws and soft whimpers while asleep	Normal (dreaming)	Let them sleep; avoid touching suddenly to wake them
Trembling at the vet, in storms, with fireworks or near strangers	Fear or stress	Remove or reduce the trigger, offer a safe spot, stay calm
Shaking with a hunched back, reluctance to move or yelping when touched	Possible pain	Call your vet today
Shaking with vomiting, diarrhoea, drooling, wobbliness or weakness	Possible illness or poisoning	Call your vet or emergency vet now
Shaking after possible access to chocolate, sweeteners, medicines, mouldy food, slug bait or rat bait	Possible poisoning	Emergency vet now; bring the packaging
Falling over, paddling, unresponsive, drooling or losing control of bladder	Possible seizure	Keep them safe, time it, then call your vet or emergency vet
Frequent head shaking, scratching an ear, smell or redness	Likely ear problem	Book a vet check
Mild trembling in the back legs of an old dog when standing	Often age-related, but worth checking	Mention it at a routine vet visit, sooner if it changes

Everyday reasons dogs shake

Cold or wet

Small dogs, thin-coated breeds such as Whippets and Greyhounds, puppies, seniors and dogs with little body fat lose heat quickly. Shivering on a cold morning or after a bath is the body warming itself up. Dry them well, keep them out of draughts, and consider whether a coat would help on cold walks; does your dog really need a coat? helps you decide.

Excitement

Many dogs tremble with excitement when you get the lead out, when visitors arrive or before a game. If the shaking comes with a loose, wiggly body and a happy face, and stops once the moment passes, it’s nothing to worry about.

Dreaming

Dogs often twitch, paddle or tremble in deep sleep. These movements are usually brief and the dog wakes normally and quickly. If sleep movements are violent, long-lasting, or your dog seems confused or can’t be woken easily, film it and show your vet.

The post-bath or post-stress shake-off

The quick full-body shake after a bath, a cuddle, an exciting greeting or a tense meeting with another dog is completely normal. Many trainers see it as a dog’s way of shaking off tension and moving on.

Fear, stress and anxiety shaking

Trembling is a common sign of fear. You’ll usually see other signals too: a tucked tail, ears pulled back, lip licking, yawning, a lowered body, panting, hiding or trying to leave. Storms, fireworks, vet visits, car rides and new places are typical triggers. Our guides to the hidden signs of stress in your dog and reading dog body language help you spot what your dog is telling you.

How to help a frightened, shaking dog:

1. Reduce the trigger if you can. Close curtains, turn on calm background sound, or move further away from whatever is worrying them.
2. Offer a safe place. A covered bed or crate with the door open, in a quiet room, gives them somewhere to retreat.
3. Comfort is fine. You can’t reinforce fear by gently comforting a scared dog. Stay calm, speak softly and let them lean on you if they want to.
4. Don’t force them to face it. Holding a dog near the thing they fear can make the fear stronger.
5. Plan ahead. For fireworks and storms, the steps in helping a dog scared of fireworks or thunder work best when started well before the noisy season.

If your dog is regularly so frightened they shake, it’s worth talking to your vet. Ongoing fear affects welfare, and your vet can check for pain, discuss options and refer you to a qualified behaviour professional.

Red flags: shaking that needs a vet now

Shaking can be a sign of pain, illness or poisoning. Veterinary sources list several kinds of causes, including toxins, metabolic problems such as low blood sugar or low calcium, and conditions affecting the nerves and muscles. You don’t need to know which one it is; you just need to recognise that it’s time for your vet.

Contact your vet or nearest emergency vet straight away if shaking comes with any of the following:

• vomiting, diarrhoea or heavy drooling
• weakness, wobbliness, stumbling or difficulty standing
• pale, grey, blue or very red gums
• a swollen or tight tummy, retching without bringing anything up, or restlessness
• signs of pain, such as a hunched back, crying out, reluctance to move or guarding part of the body
• a very hot body after exercise or warm weather, with heavy panting
• confusion, unresponsiveness, collapse or a seizure
• a tiny puppy or toy-breed dog that is trembling, weak and hasn’t eaten

Possible poisoning

Many toxins can cause tremors or seizures in dogs. ASPCA Animal Poison Control lists foods such as xylitol (a sweetener in some sugar-free products), caffeine and dark chocolate; some human medicines; certain plants and mushrooms; slug and rat baits; some insecticides; recreational drugs; mouldy food; and homemade play dough or salt dough. If there’s any chance your dog has eaten something like this, don’t wait for symptoms to get worse. Call your vet or an animal poison helpline in your country, and take the packaging with you. Do not try home remedies or make your dog sick unless a vet tells you to. If chocolate is the worry, see dog ate chocolate: the right steps to take.

Seizures

If you think your dog is having a seizure, keep calm and keep them safe. Move furniture or other pets away, keep your hands away from their mouth (dogs can bite without meaning to during a seizure), keep the room quiet and note the time. Call your vet as soon as it’s over, even if your dog seems to recover. Veterinary neurology guidance treats a seizure lasting more than five minutes, or several seizures close together, as an emergency, so head to your nearest emergency vet if that happens. If you can, film part of the episode safely; it helps your vet enormously.

Head shaking: often an ear clue

Occasional head shaking is normal. Frequent head shaking, especially with scratching at one ear, tilting the head, a smell, redness, discharge or crying when the ear is touched, often points to an ear problem. That can be infection, allergies, mites, or something like a grass seed stuck in the ear canal. Repeated, hard head shaking can also burst a blood vessel in the ear flap, causing a soft, swollen ear. Our guide to dog ear infection signs explains what to look for. Don’t put anything into the ear before your vet has looked, because some ear drops and cleaners aren’t safe if the eardrum is damaged.

Older dogs whose back legs tremble

Some very old dogs develop a slow, mild trembling in one or both back legs, most noticeable when they stand still. Veterinary neurology notes describe this as common in elderly dogs, with an unknown cause and, in many cases, little effect on wellbeing. But trembling legs in older dogs can also be a sign of pain, arthritis, weakness or other illness, so it’s worth a vet check rather than putting it down to age. How to care for a senior dog covers other changes to look out for.

What to note before you call the vet

Clear information helps your vet decide how urgent things are. Note what you can:

1. When the shaking started and how long it has lasted
2. Whether it’s the whole body, the head, or certain legs
3. Whether your dog can respond to their name during it
4. Anything that happened just before: exercise, heat, a fright, a fall, food, bin raiding
5. Any possible access to medicines, foods, plants, baits or chemicals
6. Other signs: vomiting, diarrhoea, drinking more, limping, appetite changes
7. Your dog’s age, weight and any existing health conditions or medicines
8. A short video, if it’s safe to film

Our calm guide to when to call the vet can help if you’re unsure how fast to act.

Common mistakes

• Assuming it’s always the cold. If your dog is warm and dry and still shaking, look for another cause.
• Waiting for poisoning signs to get worse. With toxins, early help makes the biggest difference.
• Giving human medicines. Many human painkillers and other medicines are dangerous to dogs. Only give what your vet prescribes.
• Putting your hand in the mouth of a seizing dog. Dogs can’t swallow their tongues, and you could be bitten badly.
• Telling off a frightened dog. Punishing or scolding fear makes it worse and damages trust.
• Ignoring repeated head shaking. Ear problems are uncomfortable and tend to get harder to resolve the longer they’re left.
• Putting leg trembles down to “just old age”. Older dogs hide pain well, so let your vet decide.

Sources this guide draws on: ASPCA Animal Poison Control information on toxins linked to seizures in dogs; veterinary neurology proceedings on tremors in dogs published by dvm360; Veterinary Neurology Institute of the Chesapeake owner guide to canine epilepsy.

Frequently asked questions

Why is my dog shaking and acting weird?

Shaking with unusual behaviour, such as hiding, restlessness, confusion or not wanting to move, can mean fear, pain, illness or poisoning. If there’s no obvious harmless cause like a storm or a bath, or other signs appear, call your vet the same day, and straight away if your dog seems unwell or could have eaten something toxic.

Why is my dog shaking and panting?

Shaking and panting together are common with fear, for example during fireworks or at the vet. They can also be a sign of pain, overheating or illness. If your dog isn’t obviously scared, or is panting heavily at rest or after warm weather, contact your vet promptly.

Why is my small dog shaking so much?

Small and toy dogs lose heat fast and often shiver when cool, and many tremble with excitement or nerves. Very small puppies and toy breeds can also become unwell quickly if they don’t eat, so a small dog that’s trembling and weak, floppy or off their food needs a vet straight away.

Is it a tremor or a seizure?

During a tremor, a dog is usually alert and can look at you when you say their name. During a generalised seizure, they’re usually unresponsive and may fall over, paddle, drool or lose bladder control. Film it if you safely can, and always call your vet after a suspected seizure.

Why does my dog keep shaking his head?

Repeated head shaking is often a sign of ear discomfort from infection, allergies, mites or something stuck in the ear. Book a vet check, and don’t put drops or cleaners in the ear until your vet has examined it.

Shaking is often harmless, but it’s one of your dog’s ways of telling you something. Look at the whole picture, comfort them if they’re scared, and trust your instincts: if something feels wrong, your vet would always rather hear from you early.