Dog Health
Why Is My Dog Shaking?
Published Last updated 3 min read
Quick answer
Dogs shake for reasons ranging from cold and excitement to pain, nausea, toxins, and seizures. Occasional shivering after a bath or during fireworks may be normal. Contact your vet if shaking is new, persistent, or paired with vomiting, collapse, or behaviour changes — especially after possible toxin exposure.
Key takeaways
- Anxiety, excitement, pain, nausea, toxin exposure, low blood sugar, and neurological conditions can all cause shaking unrelated to temperature. Context and other symptoms help narrow the cause.
- Some small breeds tremble when excited or anxious — a behaviour sometimes called 'small dog syndrome.' Persistent or new-onset shaking in any size dog deserves veterinary evaluation.
- Shaking with collapse, seizures, vomiting, known toxin ingestion, difficulty breathing, or extreme lethargy needs immediate veterinary care. Do not wait to see if it passes.
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Normal reasons dogs shake
Not every tremble signals illness. Common benign causes include:
- Cold — short-coated, elderly, or thin dogs shiver to generate heat
- Excitement — greeting you at the door or anticipating a walk
- Anxiety or fear — thunderstorms, vet visits, or separation
- Wet coat — shaking off water after swimming or bathing
These episodes are usually brief and stop once the trigger passes.
Pain and illness
Shaking can be a subtle pain signal. Conditions that may cause trembling include:
- Arthritis or injury — especially if the dog avoids movement or yelps when touched
- Abdominal pain — pancreatitis, bloat, or gastrointestinal obstruction
- Ear infections — head tilt and balance issues may accompany shaking
- Fever or infection
- Nausea — often seen with car sickness or digestive upset
Dogs often hide pain. Shaking plus reduced appetite, restlessness, or posture changes warrants a vet visit.
Toxins and metabolic causes
Certain exposures cause muscle tremors or seizures:
- Chocolate, xylitol, and other toxins
- Low blood sugar (hypoglycaemia) — common in toy-breed puppies and diabetic dogs on insulin
- Low calcium in nursing mothers
- Organ failure — kidney or liver disease affecting electrolytes
If shaking follows ingestion of a suspected toxin, contact your vet or a poison helpline immediately.
Neurological causes
More serious tremors include:
- Generalised seizures — collapse, paddling, loss of consciousness, drooling
- Partial seizures — focal twitching of one body part
- Idiopathic head tremors — rhythmic head bobbing in some breeds, usually benign
- Canine cognitive dysfunction — senior dogs may pace and tremble at night
Video recording an episode helps your vet distinguish seizure activity from other tremors.
What to do
- Note when shaking started and what was happening at the time
- Check for other signs — vomiting, limping, disorientation, drooling
- Keep the dog warm and calm if anxiety or cold is the likely cause
- Call your vet if shaking is new, worsening, or unexplained
- Seek emergency care for shaking with collapse, known toxin ingestion, or bloat signs
Do not give human medications to stop tremors without veterinary guidance.
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-24).
- Chocolate Poisoning in Dogs
- Xylitol Poisoning in Dogs
- Why Is My Dog Limping?
- Adder Snake Bites in Dogs UK
- Adopting a Rescue Dog in the UK
- Alabama Rot in Dogs UK
- Bloat in Dogs (GDV)
- Can Dogs Eat Apples UK?
Also see symptoms, symptom checker, and poison guide.
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Frequently Asked Questions
- Why does my dog shake when not cold?
- Anxiety, excitement, pain, nausea, toxin exposure, low blood sugar, and neurological conditions can all cause shaking unrelated to temperature. Context and other symptoms help narrow the cause.
- Is shaking normal in small dogs?
- Some small breeds tremble when excited or anxious — a behaviour sometimes called 'small dog syndrome.' Persistent or new-onset shaking in any size dog deserves veterinary evaluation.
- When is dog shaking an emergency?
- Shaking with collapse, seizures, vomiting, known toxin ingestion, difficulty breathing, or extreme lethargy needs immediate veterinary care. Do not wait to see if it passes.
- Can old dogs shake because of age?
- Senior dogs may develop tremors from arthritis pain, cognitive decline, or idiopathic old-dog vestibular syndrome. A vet exam rules out treatable causes such as pain or metabolic disease.