Seeing your dog tremble can be worrying, especially when there is no obvious reason for it. You may find yourself asking, “Why does my dog shake when they are not even cold?”
Dogs can shake because they are excited, frightened, cold or dreaming. However, trembling can also be associated with pain, poisoning, illness or a neurological condition. The surrounding circumstances—and any other symptoms—can help you decide what to do next.
Why does my dog shake?
Shaking is an involuntary movement that may affect one part of the body or the whole dog. It can appear as fine trembling, larger muscle movements or intermittent twitching.
Some causes are harmless and short-lived. Others need prompt veterinary attention. If the shaking is new, severe, persistent or accompanied by changes in your dog’s behaviour or movement, contact your vet.
1. Your dog is cold
Like people, dogs may shiver when their body temperature drops. Small dogs, puppies, older dogs and dogs with thin coats can be particularly sensitive to cold weather.
Move your dog somewhere warm and dry, offer a blanket and see whether the shaking settles. After wet winter walks, dry them thoroughly and provide a warm place to rest.
Severe or prolonged cold exposure can lead to hypothermia, so seek veterinary advice if your dog seems weak, confused, unusually sleepy or has difficulty breathing.
2. Fear, anxiety or stress
Dogs commonly shake during thunderstorms, fireworks, car travel, grooming appointments or visits to the vet. You might also notice panting, pacing, hiding, yawning, lip licking, pinned-back ears or attempts to escape.
Create distance from the trigger where possible and give your dog access to a quiet, secure space. Stay calm and allow them to choose whether they want comfort. For deaf dogs, unexpected touch or movement can be startling, so approach where they can see you and use familiar visual signals.
Frequent or intense fear deserves attention. A veterinarian or qualified force-free behaviour professional can help you develop a gradual support plan.
3. Excitement or anticipation
Some dogs tremble when they see their lead, hear food being prepared or greet someone they love. This type of shaking usually stops once the excitement passes, and the dog otherwise appears relaxed, alert and comfortable.
If your dog becomes overexcited regularly, calm routines and rewarding settled behaviour may help them regulate their energy.
4. Dreaming during sleep
Dogs can twitch, paddle their legs, move their eyes or make quiet noises while dreaming. These movements are generally brief and occur while the dog remains asleep.
Avoid waking a dreaming dog by touching them suddenly, as they may become startled. If you need to wake them, call their name or make a gentle sound. With a deaf dog, you might create a light floor vibration from a safe distance or allow them to wake naturally.
Speak to your vet if the movements are violent, prolonged, also occur while awake or leave your dog confused afterwards.
5. Pain or discomfort
Pain is an important possible answer to the question, “Why does my dog shake?” A dog experiencing an injury, abdominal discomfort, dental pain or joint disease may tremble while resting or moving.
Other signs can include:
- Limping or moving stiffly
- Reluctance to jump, climb stairs or be touched
- A hunched or tense posture
- Panting when the weather is not hot
- Whining, hiding or restlessness
- Reduced appetite
- Difficulty getting comfortable
Dogs do not always cry when they are in pain. Behavioural and mobility changes may be the only clues. VCA Animal Hospitals lists difficulty rising, reluctance to jump and changes in movement among the possible signs of pain in dogs.
Never give your dog human pain medication unless a veterinarian specifically instructs you to do so.
6. Nausea, fever or illness
Shaking may occur when a dog feels nauseated or generally unwell. Look for vomiting, diarrhoea, drooling, repeated swallowing, reduced appetite or lethargy.
A dog with a fever may be reluctant to move and can show shivering, stiffness, dehydration or faster breathing, according to VCA Animal Hospitals’ guidance on fever in dogs.
Contact your vet if the shaking continues or your dog has other signs of illness. Puppies, senior dogs and dogs with existing medical conditions may need assessment sooner.
7. Poisoning
Tremors can be a sign that a dog has eaten or encountered something toxic. Potential hazards include chocolate, xylitol, human medications, nicotine products, rodenticides, poisonous plants and some mouldy foods.
Poisoning may also cause:
- Vomiting or excessive drooling
- Weakness or collapse
- Agitation or unusual sleepiness
- Loss of coordination
- Breathing difficulties
- Seizures
Do not wait for symptoms if you know or suspect that your dog has consumed something poisonous. Do not induce vomiting unless a veterinary professional tells you to.
In Australia, contact your veterinarian or the Animal Poisons Helpline on 1300 869 738. Have your dog’s weight and the product packaging available if possible.
8. Low blood sugar or another medical condition
Low blood sugar can cause weakness, shaking, disorientation, collapse or seizures. It can be particularly concerning in very young puppies, small dogs and dogs receiving insulin.
Tremors may also be associated with liver or kidney disease, electrolyte abnormalities and disorders affecting the brain, spinal cord or nerves. The MSD Veterinary Manual notes that metabolic and neurological conditions can produce tremors, weakness, poor coordination and seizures.
Veterinary examination and testing are needed to identify the cause.
Is shaking the same as a seizure?
Not necessarily. A trembling dog will often remain conscious, aware and responsive. During a generalised seizure, a dog may collapse, lose awareness, stiffen, paddle their legs, drool or lose bladder and bowel control.
Seizures can vary in appearance, however, and some are much less dramatic. VCA explains that seizure activity can range from mild shaking and staring to complete loss of consciousness.
If an episode occurs safely within view, record a short video and time it. This can be extremely useful to your vet. Keep your hands away from your dog’s mouth and move nearby objects out of the way.
When should I call the vet?
Seek urgent veterinary help if your dog’s shaking:
- Begins suddenly and is severe
- Follows possible poisoning, trauma or heat exposure
- Occurs with collapse, breathing difficulty or pale, blue or grey gums
- Is accompanied by repeated vomiting, marked weakness or loss of coordination
- Appears to be a seizure, particularly one lasting several minutes or repeated episodes
- Occurs in a nursing mother, as this may indicate dangerously low calcium
- Is causing obvious distress or rapidly getting worse
Arrange a regular veterinary appointment if the shaking is mild but keeps returning, lasts longer than expected or is accompanied by changes in appetite, mobility, sleep or behaviour.
What information should I give the vet?
Note when the shaking began, how long it lasts and what your dog was doing beforehand. Record any recent dietary changes, medications, injuries or possible access to toxins. A clear video can help your vet distinguish trembling from pain, weakness, head shaking or seizure activity.
So, why does my dog shake? Sometimes the answer is simply cold, excitement or a vivid dream. At other times, shaking is the body’s warning that something is wrong. Watching the whole dog—not just the tremor—and seeking veterinary advice when you are unsure is the safest approach.