Why Is My Dog Shaking? Causes and How to Help

You reach down to stroke her and feel it under your hand — a fine, steady tremble running through her little body. Maybe it comes on during a storm, maybe when a stranger visits, or maybe it seems to happen for no reason at all. If you are worried and wondering why is my dog shaking, your instinct to pay attention is exactly right. Trembling is one of the ways dogs tell us that something — physical or emotional — is not quite right.

As a veterinarian, I want to reassure you: many causes of shaking are harmless and manageable, and quite often the reason is emotional — fear, anxiety, or excitement. But because trembling can occasionally signal something medical, it is worth understanding what is normal, what is not, and when to pick up the phone.

This guide explains the common reasons dogs shake, how to tell everyday trembling from a red flag, and the gentle, practical ways to help an anxious, shaky dog feel safe again.

Why is my dog shaking?

Dogs shake or tremble for a wide range of reasons, and they fall into two broad groups: emotional causes like fear, anxiety, stress, and excitement, and physical causes like cold, pain, illness, or simply being a small breed. The most common everyday reason is emotional — a dog who is frightened or overstimulated. The key is to look at when the shaking happens and what else is going on with your dog.

The common reasons dogs tremble

Fear and anxiety

This is the big one. Trembling is a classic sign of fear or anxiety in dogs, often appearing alongside a tucked tail, pinned ears, panting, pacing, or hiding. Storms, fireworks, car rides, vet visits, strangers, or being left alone can all set it off. If your dog shakes in these specific situations, anxiety is very likely the cause.

Cold

Just like us, dogs shiver when they are cold — especially small dogs, thin-coated breeds, puppies, and seniors. If your dog trembles on a chilly morning or after a bath, she may simply need warming up.

Excitement

Not all shaking is distress. Many dogs quiver with sheer excitement — when you come home, before a walk, or waiting for dinner. This happy trembling is harmless and usually passes as soon as the exciting moment does.

Being a small breed

Some little dogs — Chihuahuas are the classic example — seem to tremble much of the time. For these breeds a certain amount of shaking can be normal for them, though it is always worth confirming with your veterinarian that there is nothing more to it.

Pain or illness

This is the important one to rule out. Trembling can be a sign that a dog is in pain or feeling unwell. Nausea, a fever, or a range of medical conditions can all cause shaking — which is why new, unexplained trembling always deserves attention.

Having eaten something toxic

Certain toxins — including chocolate, xylitol (a sweetener), some plants, and moldy food — can cause trembling or shaking. This is an emergency. If your dog is shaking and you suspect she has eaten something she should not have, treat it as urgent (see the safety note below).

When shaking is an emergency

Most trembling is not urgent — but some is. Please contact your veterinarian or an emergency clinic right away if your dog is shaking and shows any of these:

• ✖You suspect she ate something toxic (chocolate, xylitol, a plant, medication)
• ✖The shaking comes with vomiting, diarrhea, collapse, or extreme lethargy
• ✖She seems disoriented, unsteady, or the shaking looks like a seizure
• ✖There are signs of pain — crying out, a hunched posture, a tense belly
• ✖The trembling is new, severe, or will not stop

Trust your instincts. You know your dog better than anyone, and if something feels seriously wrong, it is always better to call. A seizure — where a dog may fall, paddle her legs, lose awareness, or lose bladder control — is different from ordinary trembling and needs prompt veterinary attention.

Shaking vs. a seizure — how to tell

Owners often worry that trembling is a seizure, so it helps to know the difference. With ordinary trembling or shivering, your dog is fully aware — she can look at you, respond to her name, and move normally. A seizure is different: she may lose awareness, stiffen or fall over, paddle or jerk her limbs, drool heavily, or lose control of her bladder or bowels, and afterward seem dazed. If you ever see signs of a true seizure, contact your veterinarian right away, and if you safely can, take a short video — it genuinely helps with diagnosis.

When the cause is anxiety

If your veterinarian has ruled out medical causes and your dog trembles specifically in stressful situations — storms, strangers, being left alone — then anxiety is the driver, and this is very much something you can help with. The trembling is part of her body's fear response, and easing the anxiety eases the shaking.

The most common anxiety triggers I see behind trembling are:

• ✔Loud noises like thunderstorms and fireworks
• ✔Being left alone, or separation anxiety
• ✔Strangers, unfamiliar dogs, or new places
• ✔Car rides and vet visits
• ✔Changes in routine or household

To read the fuller picture of how dogs show worry, our guide to the signs of stress in dogs is a helpful companion.

How to help a shaky, anxious dog feel calm

When trembling is about fear, these gentle steps help your dog feel safe.

1. Stay calm yourself

Your dog takes her emotional cues from you. If you stay relaxed and speak in a low, easy voice, you tell her there is nothing to fear. Rushing to her with worried, high-pitched reassurance can accidentally confirm that something is wrong.

2. Offer a safe space

Give your dog a cozy, predictable retreat — a bed or quiet corner that is always hers — where she can settle when the world feels overwhelming. Let her use it freely, and never force her out.

3. Comfort her — you cannot reinforce fear

If your dog seeks you out while trembling, comfort her freely. The old idea that soothing a frightened dog "rewards" the fear is a myth; you cannot reinforce an emotion the way you reward a trick. Slow, gentle strokes and a calm voice genuinely help her recover.

4. Keep a steady routine

Predictability is deeply reassuring to an anxious dog.

5. Add gentle calming support

For dogs who tend toward anxiety, a little extra calming support can help them cope with stressful moments. One of the gentlest options is the dog-appeasing pheromone — a copy of the natural, comforting scent a mother dog gives off to reassure her puppies. It is undetectable to us, non-sedating, and works quietly in the background.

This is exactly why we created the CalmiCollar: a wearable calming collar that surrounds your dog with that reassuring, mother-dog scent all day, helping an anxious dog feel safer — gently, and without sedation. For the wider approach, see our guide on how to calm an anxious dog and our roundup of natural remedies for dog anxiety.

6. Warm her up if she is cold

If the shaking is simply cold, a cozy sweater, a warm bed away from drafts, and a snuggle usually do the trick — especially for small, thin-coated, or senior dogs.

What not to do

• ✖Punishing or scolding a trembling dog — fear-based trembling only gets worse
• ✖Forcing her toward whatever frightens her to "get her used to it"
• ✖Assuming new, unexplained shaking is "just anxiety" without a vet check
• ✖Giving any human medication or sedative without your veterinarian's guidance

Frequently asked questions

Why is my dog shaking but acting normal?

If your dog is trembling yet eating, playing, and behaving normally, the cause is often emotional (excitement or mild anxiety), cold, or — in some small breeds — simply their baseline. It is still worth mentioning to your veterinarian, especially if it is new, but a bright, normal dog who shakes now and then is usually less concerning than a shaking dog who also seems unwell.

Should I comfort my dog when she is shaking from fear?

Yes. Comforting a frightened dog does not reinforce the fear — that is a myth. Calm, gentle reassurance helps her feel safe and recover faster. If she would rather hide than be touched, let her, and simply stay nearby.

Why does my dog shake at night?

Nighttime shaking can be cold, anxiety about being alone in the dark, or, in older dogs, discomfort or confusion. Make sure she is warm and has a cozy bed near you, and if it is new or persistent — especially in a senior dog — check with your veterinarian. Our guide to dog anxiety at night can help.

Can anxiety really make a dog tremble?

Absolutely. Trembling is one of the body's classic fear responses, in dogs as in people. Anxious dogs often shake during storms, fireworks, vet visits, or when left alone, usually alongside other signs like panting, pacing, or hiding. Easing the anxiety typically eases the shaking.

When should I worry about my dog shaking?

Treat it as urgent if the shaking comes with vomiting, collapse, disorientation, signs of pain, or a suspected toxin, or if it looks like a seizure. Also see your veterinarian for any new, unexplained, or worsening trembling, even without other symptoms — it is always better to check.

Does a calming collar help with anxiety trembling?

It can be a helpful part of the plan. Dog-appeasing pheromones have been shown to reduce fear and anxiety in dogs^[1], and a collar provides that reassurance continuously. Pair it with a safe space, a steady routine, and your own calm presence for the best effect.

My senior dog has started trembling — is that normal?

New trembling in an older dog is always worth a veterinary visit. It can be linked to pain (such as arthritis), other medical conditions, or age-related changes, many of which are treatable. Please do not simply write it off as "old age" — have your veterinarian take a look.

The bottom line

A trembling dog is asking for your help, and most of the time the cause is something you can manage — fear, cold, or excitement. Watch when the shaking happens and what else is going on: a bright, normal dog who shakes in storms needs calm and comfort, while a shaking dog who also seems unwell, or who may have eaten something toxic, needs your veterinarian right away. When anxiety is the cause, a safe space, a steady routine, gentle calming support, and your own reassuring presence can help your dog feel safe and settled once more.

This article is for general educational purposes and reflects general veterinary guidance. It is not a substitute for individual veterinary advice, diagnosis, or treatment. Every dog is different — if your dog's behavior changes suddenly or you are worried about her health, please contact your veterinarian. In a suspected poisoning emergency, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away.

References

To read a study, copy and paste the link into your browser.

[1] Landsberg GM, Beck A, Lopez A, Deniaud M, Araujo JA, Milgram NW. Dog-appeasing pheromone collars reduce sound-induced fear and anxiety in beagle dogs: a placebo-controlled study. Veterinary Record. 2015;177(10):260. https://doi.org/10.1136/vr.103172

[2] Weng HY, Ogata N. The impact of COVID-19 pandemic on pet behavior and human-animal interaction: a longitudinal survey-based study in the United States. Frontiers in Veterinary Science. 2023;10:1291703. https://doi.org/10.3389/fvets.2023.1291703