Dog Shaking: Why Dogs Tremble and When It's Serious

Quick Answer: Watch and Assess

Shaking after a bath or from cold is harmless. Sudden trembling in a dog that seems confused, is drooling excessively, or can't stand is an emergency.

Not sure how serious this is?Use the Symptom Checker →

Trembling and shaking in dogs ranges from the completely normal (wet dog shake, cold shivers) to the life-threatening (toxin ingestion, seizure precursor). The context around the shaking is everything.

Most Common Causes

Cold or wet (common)

Most obvious cause. Dogs shake to generate heat and dry off. Completely normal.

Fear, anxiety, or stress (common)

Thunderstorms, vet visits, fireworks, strangers. Shaking paired with ears back, tail tucked, yawning.

Excitement (common)

Some dogs shake when anticipating something good: a walk, feeding time, reunion with their person.

Pain (moderate)

A dog in pain may shake or tremble. Often paired with reluctance to move, guarding a body part, or crying when touched.

Nausea (moderate)

Dogs often tremble before vomiting. Car sickness is a common trigger.

Hypoglycemia (low blood sugar) (moderate)

More common in toy breeds and puppies. Shaking with weakness, disorientation, possible seizure.

Toxin ingestion (rare)

Xylitol, chocolate, certain plants, nicotine, drugs. Shaking, drooling, dilated pupils.

Distemper or neurological disease (rare)

Head tremors, leg tremors, loss of coordination. Distemper is vaccine-preventable.

Wait, Act, or Emergency?

You Can Watch and Wait If:

Shaking after a bath
Shaking during a storm or fireworks
Mild trembling at the vet office

Call or Visit Your Vet If:

Shaking paired with lethargy, weakness, or vomiting
Dog cannot bear weight on limbs while shaking
Shaking that comes on suddenly with no obvious trigger
Small or toy breed puppy shaking (hypoglycemia risk)

Go to Emergency Vet Immediately If:

Violent, whole-body tremors
Shaking with drooling, dilated pupils, or collapse
Known toxin ingestion
Seizure-like activity (paddling, loss of consciousness)

Still not sure what to do?

Our interactive checker walks you through symptoms, severity, and duration -- and gives you a clear go/wait/monitor answer.

Open Symptom Checker

Frequently Asked Questions

Why does my dog shake when sleeping?

Sleep tremors are normal. Dogs in REM sleep often twitch and tremble -- they're dreaming. If your dog is easily roused and returns to normal, it's not a seizure.

Why do small dogs shake so much?

Smaller dogs have higher metabolic rates and less body mass to retain heat, making them more prone to cold shivers. They also tend to be more anxious. Some small breeds like Chihuahuas and Miniature Pinschers are simply more prone to trembling.

Can a dog shake from old age?

Yes. Muscle weakness and degenerative neurological changes in senior dogs can cause trembling, especially in the rear legs. This is different from a seizure and is typically consistent and mild.

What should I do if my dog is shaking uncontrollably?

Stay calm, note the time, keep the dog safe (away from stairs and furniture), and do not restrain the dog forcefully. If the episode lasts more than 2-3 minutes or the dog doesn't recover fully, go to an emergency vet.

Is Your Dog an American Bulldog?

American Bulldogs have breed-specific health vulnerabilities. ABRA-registered dogs from health-tested lines have better documented health histories.

Search American Bulldog Pedigrees ABRA Registry