Why Do Dogs Shiver?

Shivering can look scary, especially when it comes out of nowhere. As a veterinary assistant in Frisco, Texas, I can tell you this: sometimes shivering is completely normal, and sometimes it is your dog’s way of saying, “I need help.” The key is noticing what else is happening along with the tremble.

This guide walks you through the most common reasons dogs shiver, what you can safely do at home, and when it is time to contact your veterinarian right away.

Shivering: what it is and what it is not

Shivering is a muscle tremor. It can be caused by cold, excitement, stress, pain, nausea, fever, toxin exposure, or a neurologic problem. More than one cause can overlap, so the context matters.

Shivering is different from:

• Seizures (often less responsive, may drool, lose bladder control, or seem “not there”)
• Itching or skin twitching (often localized to one area, may scratch or bite at skin)
• Weakness or wobbliness (difficulty standing, stumbling)

One simple clue: a chill from cold usually improves with warmth and relaxation. True tremors often continue even when your dog is comfortable.

If you are not sure what you are seeing, take a short video with your phone. Videos are incredibly helpful for your vet.

Common reasons dogs shiver

1) Cold or wet

This is the simplest explanation, especially in small dogs, short-haired dogs, seniors, and dogs with low body fat. Being wet makes heat loss happen faster.

• Clues: shivering starts after a walk in cool weather, after a bath, or in strong air conditioning
• What to do: dry them thoroughly, offer a warm blanket, and move to a draft-free area

2) Excitement or adrenaline

Some dogs tremble when they are thrilled, anticipating a walk, greeting someone, or waiting for food. It is not always a problem.

• Clues: relaxed face, normal walking, normal appetite, stops once the “exciting thing” passes
• What to do: keep greetings calm, ask for a sit, reward calm behavior, and observe

3) Fear, stress, or anxiety

Thunderstorms, fireworks, car rides, vet visits, new environments, and separation anxiety can all trigger full-body shaking.

• Clues: panting, tucked tail, ears back, hiding, pacing, wide eyes
• What to do: create a quiet safe space, use white noise, close curtains, and consider a veterinarian-approved calming plan

4) Pain or injury

Pain is one of the most overlooked causes of shivering. Dogs may shake with back or neck pain, abdominal pain, dental pain, arthritis, or after an injury.

• Clues: reluctance to jump or climb stairs, limping, yelping, hunched posture, guarding a body part, tense belly, unusual irritability
• What to do: restrict activity and contact your clinic for advice. Do not give human pain medications.

5) Nausea or stomach upset

Yes, some dogs shiver when they feel nauseated. It can happen with mild tummy trouble or more serious problems like pancreatitis, an intestinal blockage, or bloat.

• Clues: drooling, lip-licking, swallowing, vomiting, diarrhea, refusing food, “praying position” (front end down, rear end up)
• What to do: offer water, avoid rich treats, and reach out to your vet if symptoms persist or are severe

6) Fever or infection

Dogs can shiver with fever just like humans. A fever often means infection or inflammation, and it deserves attention.

• Clues: lethargy, decreased appetite, coughing, nasal discharge, painful body. Your dog may feel warm, but warm ears alone are not a reliable way to confirm fever.
• What to do: call your veterinarian for guidance. The only dependable way to confirm fever is a temperature reading (typically done at the clinic). Normal canine temperature is roughly 101 to 102.5°F, and fever is often over 103°F. Do not treat fever at home with over-the-counter medications.

7) Toxin exposure

Many toxins cause tremors and can become life-threatening quickly. Common concerns include certain human medications, cannabis products, chocolate, xylitol, rodenticides, snail bait, and some insecticides. Signs vary depending on what was ingested, so any suspected exposure should be treated seriously.

• Clues: sudden tremors, vomiting, drooling, agitation, abnormal heart rate, trouble walking, unusual sleepiness
• What to do: treat as an emergency. Call your veterinarian, an ER, or a pet poison hotline immediately.

8) Low blood sugar (hypoglycemia)

Small breed puppies are especially prone, but it can occur in adults too. Low blood sugar can cause weakness, tremors, and collapse.

• Clues: shakiness plus weakness, glassy eyes, pale gums, acting “spacey”
• What to do: seek urgent veterinary care. If your dog is weak, disoriented, or cannot stand, do not try to treat this at home.

9) Neurologic conditions

Some dogs experience tremors from neurologic issues such as idiopathic generalized tremor syndrome (sometimes called “white shaker syndrome,” although it can occur in many breeds), inherited tremor disorders, or spinal or brain disease.

• Clues: head bobbing, whole-body tremors that continue at rest, trouble walking, abnormal eye movements
• What to do: schedule a veterinary exam. Your vet may recommend bloodwork and possibly imaging depending on the findings.

10) Age-related changes

Seniors may shiver more from arthritis pain, muscle weakness, cognitive changes, or decreased temperature regulation.

• Clues: stiffness after resting, slower movement, changes in sleep or house training
• What to do: talk with your vet about pain control, joint support, and comfort strategies

11) Nursing mom emergency (eclampsia)

This is less common, but it is important. Nursing mothers, especially small breeds, can develop dangerously low calcium after giving birth.

• Clues: restlessness, panting, stiffness, tremors, fever, trouble walking, seizures, usually in the first few weeks of nursing
• What to do: go to an emergency clinic right away. This is not a “wait and see” situation.

12) Other medical causes

Some metabolic or endocrine conditions can show up as trembling, weakness, or shaking episodes. Addison’s disease is one example. These are less common, but worth considering if the problem keeps happening or comes with vomiting, diarrhea, collapse, or unusual lethargy.

• Clues: recurrent episodes, weakness, GI upset, low energy, collapse
• What to do: book an exam and ask what testing is appropriate

Quick home check: 2 minutes

If your dog is shivering, take a breath and do this short check. These details help you decide whether this is a comfort issue or an urgent one.

• Temperature and environment: Are they cold, wet, or under a vent?
• Behavior: Are they alert and responsive, or “not themselves”?
• Gums: Healthy gums are usually bubblegum pink and moist. Pale, white, blue, or tacky gums are concerning.
• Breathing: Is it easy and quiet, or labored?
• Movement: Any limping, hunched back, wobbliness, or collapse?
• GI signs: Vomiting, diarrhea, drooling, refusing food?
• Exposure risk: Any chance they ate something unsafe or got into meds?

If anything feels “off” beyond a simple chill or brief excitement tremble, trust your instincts and contact a veterinary professional.

When it is an emergency

Go to an emergency clinic or call your veterinarian immediately if shivering happens with any of the following:

• Difficulty breathing, open-mouth breathing at rest, or blue gums or tongue
• Collapse, severe weakness, or inability to stand
• Repeated vomiting, swollen abdomen, unproductive retching, or signs of bloat
• Suspected toxin exposure or ingestion of unknown items
• Severe pain, crying out, or a rigid, tense abdomen
• Seizure activity or altered awareness
• Very pale gums, extreme lethargy, or a rapid worsening pattern
• Shivering or tremors in a nursing mother (possible eclampsia)

If you can, bring a video of the shaking, a list of anything your dog could have eaten, and the packaging of any suspected toxins or medications.

What you can do at home

Warmth and comfort

• Dry your dog if they are wet.
• Offer a blanket and a calm, quiet space away from noise and drafts.
• Use gentle warmth only. Avoid heating pads directly on skin and avoid hot water bottles that can burn.

Reduce stress triggers

• Use white noise during storms or fireworks.
• Close curtains to reduce flashes of light.
• Keep your tone calm and routine predictable.

Hydration and food basics

• Offer fresh water.
• If the shivering seems nausea-related and your dog is otherwise stable, avoid rich or fatty foods.
• Do not force food if your dog is vomiting or acting painful.

What not to do

• Do not give human medications like ibuprofen, acetaminophen, naproxen, or aspirin unless a veterinarian specifically instructs you.
• Do not “wait it out” if shivering is paired with weakness, vomiting, abnormal gums, or suspected toxin exposure.
• Do not overexercise a shivering dog to “work it off,” especially if pain is possible.

Breed and size notes

Some dogs are simply more prone to trembling.

• Small dogs and toy breeds lose heat faster and often show excitement shivers.
• Short-coated dogs may need sweaters in cooler weather.
• Thin or senior dogs may struggle with temperature regulation and joint discomfort.

How vets find the cause

At the clinic, your veterinarian will typically start with a physical exam and targeted questions. In our day-to-day appointments, we often start by asking what was happening right before the shivering started and whether anything changed in your dog’s routine.

Depending on what your vet finds, they may recommend:

• Temperature check and pain assessment
• Bloodwork to look for infection, low blood sugar, organ stress, or inflammation
• Urinalysis and fecal testing if GI issues are present
• X-rays or ultrasound for suspected injury, abdominal pain, or obstruction
• Medication review and toxin screening when exposure is possible

The goal is to separate benign shivering from medical causes that need treatment quickly.

Prevention tips

• Weather prep: Keep a towel by the door, consider a coat for cold-sensitive dogs, and limit time outside when it is wet and chilly.
• Safe home habits: Store medications and edibles securely, and keep toxins out of reach.
• Routine care: Regular dental and wellness exams catch pain sources early.
• Nutrition: A balanced diet supports steady energy and healthy muscles. Sudden diet changes can trigger stomach upset, so transition slowly.
• Stress plan: If storms or fireworks are a recurring issue, ask your vet about evidence-based behavior tools and medications when appropriate.

Bottom line

Dogs shiver for many reasons, from being cold or excited to pain, nausea, fever, toxin exposure, or less common medical conditions. If your dog is bright, responsive, and the shivering stops after warming up or calming down, it is often not an emergency. But if shivering comes with vomiting, weakness, trouble breathing, pale gums, severe pain, or a sudden change in behavior, it is time to get veterinary help right away.

You know your dog best. If something feels unusual, you are not overreacting by getting help. You are being a good advocate.