What Does It Mean When a Dog Shakes?
Vets separate shaking into a few related but distinct behaviors. Trembling is a semi-voluntary response tied to emotion, most often fear or excitement. Shivering is an involuntary response to cold. Muscle tremors are involuntary, repetitive contractions caused by an underlying neurologic or medical issue. All three can look similar from the outside, which is why the situation around the shaking, what triggered it, how long it lasts, and what else your dog is doing, matters more than the shaking itself.
Common Non-Emergency Causes
- Cold, thin, short-coated, small, or senior dogs shiver easily and stop once they warm up.
- Excitement, some dogs tremble with joy when greeting people or anticipating a walk or meal.
- Stress, fear, or anxiety, common triggers include vet visits, thunderstorms, fireworks, or meeting a stranger.
- Drying off, the classic whole-body shake after a bath or swim.
- Old age, mild tremors in the hind legs are common as senior dogs lose muscle tone.
Serious Causes That Need Veterinary Care
Shaking that's new, persistent, or paired with other symptoms is worth taking seriously. These are some of the more common medical causes.
Pain or Injury
Dogs hide pain well. Arthritis, an injury, or internal illness can all cause trembling, often along with limping, reluctance to move, or changes in appetite.
Poisoning or Toxin Exposure
Chocolate, xylitol, certain plants, and many human medications can cause sudden tremors, often with drooling, vomiting, or agitation.
Hypoglycemia
Low blood sugar can trigger shaking and weakness, and is most common in toy breeds and young puppies who skip meals.
Generalized Tremor Syndrome
Also called shaker syndrome, this neurologic condition causes full body tremors, most often in young, small white breed dogs.
Nausea or Motion Sickness
Shaking combined with drooling, lip licking, or vomiting often points to an upset stomach or car sickness rather than a neurologic cause.
Seizure Activity
Unlike trembling, a true seizure involves loss of awareness and often muscle rigidity or paddling. See our guide on the difference below.
Shaking vs. Seizure: How to Tell the Difference
| Sign | Shaking or Trembling | Seizure |
|---|---|---|
| Awareness | Dog stays aware, may respond to name or touch | Dog loses awareness of surroundings |
| Body control | Can usually still stand and move around | Often collapses, may go rigid or paddle |
| Duration | Seconds to a few minutes, comes and goes | Typically seconds to a few minutes, followed by disorientation |
| After the episode | Returns to normal quickly | Often dazed, wobbly, or confused afterward |
If you're genuinely unsure which one you're looking at, treat it as a seizure. Learn more in our glossary entry on seizures, and always call your vet after a first seizure of any length.
- Shaking that doesn't stop within a few minutes, or keeps recurring
- Collapse, confusion, or loss of consciousness
- Pale or blue gums, or inability to stand
- Vomiting, diarrhea, or drooling alongside the shaking
- Known or suspected exposure to a toxin
- Any first-time seizure, regardless of how brief
Home Care for Mild, Situational Shaking
- Warm up a cold dog with a blanket, dog coat, or a few minutes indoors.
- Move a stressed or fearful dog to a quiet, familiar space away from the trigger.
- Speak calmly and avoid over-comforting anxious shaking, which can reinforce the fear response.
- Keep meals on a consistent schedule, especially for puppies and toy breeds prone to low blood sugar.
- Never give human medication to control shaking without your vet's guidance.
Do not wait to see if the shaking passes. Contact your vet or an emergency animal poison control line right away, and if possible, bring the packaging of whatever your dog may have eaten. See our glossary entry on pet poisoning and xylitol toxicity for more on common household toxins.
Frequently Asked Questions
How can I tell if my dog is shaking or having a seizure?
Shaking and trembling are voluntary or semi-voluntary and your dog stays aware of you the whole time, often still responding to their name or a touch. A seizure is different: your dog usually collapses, their muscles go rigid or paddle uncontrollably, and they lose awareness of their surroundings for anywhere from a few seconds to a few minutes. If you are not sure which one you are seeing, treat it as a seizure and call your vet, since seizures always need follow up.
What is shaker syndrome in dogs?
Shaker syndrome, also called generalized tremor syndrome or idiopathic tremor syndrome, is a neurologic condition that causes full body tremors, most often in small white breeds such as the Maltese, Bichon Frise, and West Highland White Terrier between about 9 months and 2 years old. The exact cause isn't fully understood, but it responds well to veterinary treatment, usually corticosteroids, once other causes have been ruled out.
My dog is shaking but seems otherwise fine. Is that normal?
Brief shaking in a dog who is eating, drinking, and behaving normally is often just excitement, cold, or a passing moment of stress, and usually stops on its own within a few minutes. Keep an eye on the pattern: shaking that keeps returning, lasts more than a few minutes at a time, or starts showing up alongside other symptoms is worth a call to your vet even if your dog seems fine in between episodes.
Can something my dog ate cause shaking?
Yes, and this is one of the more urgent causes to rule out. Chocolate, xylitol (found in sugar free gum and some peanut butter), certain plants, and many human medications can all cause tremors in dogs, often along with drooling, vomiting, or agitation. If you know or suspect your dog ate something toxic, contact your vet or a pet poison helpline immediately rather than waiting to see if the shaking passes.
Medical disclaimer: This article is for educational purposes only and does not constitute veterinary advice. Always consult a licensed veterinarian for diagnosis and treatment of your pet's health conditions.