Why Is My Dog Shaking? Causes, Warning Signs & When to Call the Vet

Not a substitute for professional veterinary advice. If your dog’s shaking seems severe, sudden, or paired with other symptoms, call your vet.

If your dog just started shaking or trembling and you’re not sure why, here’s the short version: it’s usually nothing dangerous — dogs shake when they’re cold, excited, stressed, or shaking off tension after something startled them. But shaking can also be your dog’s way of telling you something hurts, or that they’ve been exposed to something toxic, and that’s the version you don’t want to wait out.

The tricky part is that trembling, shivering, and full-body tremors can all look identical from the couch. This guide walks through the most common causes, the specific scenarios that should send you straight to the vet, and what you can do at home while you figure out which one you’re dealing with.

Common (Harmless) Reasons Dogs Shake

Most shaking falls into one of these categories, and none of them require a vet visit on their own:

Cold. Small, short-haired, and thin-coated breeds have less body mass and insulation, so shivering is simply their body generating heat. This is especially common right after a bath or a walk in wet weather.
Excitement. A dog trembling with a wagging tail, loose body, and relaxed face while greeting you or anticipating a treat is just overjoyed — not distressed.
Stress or fear. Thunderstorms, fireworks, car rides, vet visits, or a stranger reaching toward them can all trigger stress-shaking. This kind of trembling typically stops once the trigger is removed.
The “wet dog shake-off.” A full-body shake after swimming, a bath, or even just waking up is a normal reflex, not a symptom of anything.
Aging. Older dogs sometimes develop mild tremors, particularly in the hind legs, simply from muscle and joint wear.

If your dog’s shaking fits one of these and stops within a few minutes once the trigger passes, you’re almost certainly fine to just keep an eye on them.

Scenario Guide: What Your Dog’s Shaking Might Mean

1. My dog is shaking and won’t stop

If the trembling has gone on for more than a few minutes with no obvious trigger (no cold, no stress, no excitement) and shows no sign of easing, treat it as a symptom rather than a quirk. Persistent, unexplained shaking is one of the more common early signs of pain — dogs are wired to hide weakness rather than vocalize it, so a subtle full-body tremor may be the only clue something’s wrong. Call your vet and describe what you’re seeing.

2. My dog is shaking and also vomiting, weak, or acting “off”

This combination moves shaking from “watch and wait” to “call now.” Tremors paired with vomiting, disorientation, drooling, or lethargy can point to toxin exposure, a metabolic problem, or infection. Common household toxins linked to muscle tremors include chocolate, xylitol (found in sugar-free gum and some peanut butters), certain houseplants, and human medications. If you know or suspect your dog got into something they shouldn’t have, contact your vet or an animal poison control line immediately, even before symptoms fully develop.

3. My senior dog suddenly started shaking

New shaking in an older dog is worth a vet visit sooner rather than later. It can be arthritis-related pain, a sign of kidney or metabolic changes, or age-related muscle tremors that are usually harmless but worth ruling out. Because senior dogs are more likely to have an underlying condition masking the real cause, don’t assume it’s “just old age” until a vet has actually looked.

4. My puppy is shaking

Puppies — especially toy and small breeds — are prone to low blood sugar (hypoglycemia), which can cause shaking, weakness, confusion, or even fainting if a meal is skipped. If your puppy is trembling and hasn’t eaten recently, offer a small meal and call your vet if the shaking doesn’t resolve quickly or if they seem disoriented. Puppy shaking paired with lethargy or reluctance to eat should never be brushed off.

5. My dog only shakes in specific situations (vet visits, storms, strangers)

This is almost always anxiety- or fear-based, and it’s genuinely common. It doesn’t need emergency care, but it is worth addressing — chronic stress isn’t great for a dog’s quality of life. Look at what’s consistently triggering it and consider talking to your vet or a certified trainer about desensitization strategies if it’s happening often.

6. My small, white dog trembles constantly for no reason

There’s a specific, real condition worth knowing about: generalized tremor syndrome, sometimes nicknamed “shaker syndrome,” which most often shows up in small white breeds like West Highland White Terriers and Maltese, typically between 9 months and 2 years old. The cause isn’t fully understood, but it’s believed to be inflammatory in nature, and affected dogs often respond well to treatment. It’s not usually dangerous, but it does need an actual diagnosis from a vet rather than a guess, since several more serious neurological conditions can look similar.

When Shaking Is a Medical Emergency

Stop monitoring and get emergency care if shaking is accompanied by any of the following:

Seizure activity (rigid limbs, loss of consciousness, paddling motions)
Vomiting or diarrhea alongside the tremors
Known or suspected exposure to a toxin, poison, or plant
Extreme lethargy or inability to stand
A hunched, “praying position” posture, which can signal abdominal pain
Shaking that started suddenly and is getting worse, not better

When in doubt, the safest move is always to call — most vet clinics and emergency lines will help you triage over the phone before deciding whether you need to come in.

What to Expect at the Vet

For persistent or unexplained shaking, a vet will typically start with a physical exam and a history of when the shaking started, how long it lasts, and what (if anything) triggers it. Depending on what they find, they may run bloodwork to check blood sugar, organ function, and electrolytes, and in some cases recommend imaging or a neurological exam to rule out conditions like generalized tremor syndrome or other movement disorders. Keeping a simple log — when the shaking happens, how long it lasts, what your dog was doing beforehand — makes this process faster and gives your vet more to work with than “it just happens sometimes.”

How to Help a Shaking Dog at Home

If they’re cold: a dog coat or towel-dry after baths and walks solves most of it, especially for short-haired and toy breeds.
If they’re anxious: remove the trigger where possible, use a calm, low voice, and give them a safe space (a crate or a quiet room) to settle in.
If they’re a small or young dog and haven’t eaten recently: offer a small meal and monitor.
If none of the above applies and the shaking persists: don’t try to wait it out. Call your vet.

FAQ

Is it normal for dogs to shake sometimes? Yes. Occasional shaking tied to cold, excitement, or a startling moment is normal and not a cause for concern on its own.

How long is too long for a dog to shake? As a rule of thumb, shaking that lasts more than a few minutes with no clear trigger, or that returns repeatedly throughout the day, is worth a call to your vet.

Can anxiety alone cause a dog to shake? Yes — fear and anxiety are among the most common causes of dog shaking, and it’s a genuine stress response, not the dog being “dramatic.”

Should I take my dog to the ER for shaking? Only if it’s paired with other red-flag symptoms (vomiting, collapse, seizure, suspected poisoning) or if it’s severe and not improving. Mild, isolated shaking can usually wait for a regular vet appointment.

Sources referenced for accuracy: PetMD’s veterinary-reviewed guide to canine shaking; interviews with Daniel Dixon, DVM (North Keller Animal Hospital) and veterinary contributors at Parade Pets; Massachusetts Veterinary Referral Hospital and Port City Veterinary Referral Hospital’s clinical overviews of tremor and shivering causes in dogs.