If you’ve ever glanced over at your dog and noticed them trembling or shaking, you know how unsettling that can be. You might wonder, “Why is my dog shaking?” Dogs shake for many reasons: some completely harmless, others worth a closer look. If your dog is shaking or trembling, the cause could be anything from cold temperatures or excitement to pain, anxiety, or an underlying medical condition. Knowing the difference is what separates a moment of relief from a call to the vet. Whether your dog shivers occasionally after a bath or trembles unexpectedly out of nowhere, this guide covers every common reason dogs shake, the symptoms that should raise a red flag, and exactly when it’s time to bring your pup in for professional care.

Common Reasons Dogs Shake or Tremble

Dog shaking or trembling has many possible causes. Some are tied to emotion or temperature, while others point to medical conditions that need attention. Getting familiar with the most likely explanations can help you assess the situation more clearly before calling your veterinarian.

Cold Temperatures

Just like people, dogs shiver when they’re cold. Smaller breeds and short-haired dogs are especially prone to shaking in chilly temperatures because they have less body mass and insulation to retain warmth. If your dog is shaking after being outside on a cold day or in an air-conditioned environment, temperature regulation is likely the culprit. A warm blanket and a cozy spot usually help resolve this type of shaking quickly.

Fear, Anxiety, and Stress

One of the most frequent reasons dogs shake is emotional distress. Dogs can tremble when they feel frightened, anxious, or overwhelmed. Common triggers include thunderstorms, fireworks, car rides, veterinary visits, and unfamiliar environments. If your dog shakes during or after one of these situations, anxiety is a very likely cause. Fearful shaking is often accompanied by other signs like tucked tail, flattened ears, excessive panting, or attempts to hide.

Excitement

Some dogs shake simply because they’re excited. You may notice your dog trembling when you grab their leash, when a favorite person walks through the door, or right before mealtime. Excitement-related shaking is typically short-lived and stops once the dog settles down. This type of trembling is generally nothing to worry about.

Pain or Discomfort

Shaking can be a dog’s way of communicating that something hurts. Whether it’s muscle soreness, joint pain, an injury, or internal discomfort, trembling is sometimes a physical response to pain. If your dog is shaking and also seems reluctant to move, is whimpering, has a hunched posture, or is avoiding being touched in certain areas, pain should be considered a possible cause. A veterinary exam is important in these cases to identify and address the underlying issue.

Medical Conditions That Can Cause Dog Shaking

Beyond situational causes, there are several medical conditions that can cause a dog to shake or tremble. Some of these conditions are manageable with veterinary care, while others require more urgent attention. Knowing what to look for helps you act quickly when it matters most.

Hypoglycemia (Low Blood Sugar)

Low blood sugar is a common cause of dog shaking, especially in puppies and small breeds like Chihuahuas, Yorkshire Terriers, and Toy Poodles. When blood glucose levels drop too low, the body can’t function properly, and trembling is one of the first visible signs. Other symptoms of hypoglycemia include weakness, disorientation, and lethargy. This is a medical emergency that requires prompt veterinary care.

Generalized Tremor Syndrome

Generalized Tremor Syndrome (GTS), sometimes called Shaker Syndrome or White Dog Shaker Syndrome, is an inflammatory condition of the nervous system. While it was first identified in small white dogs such as Maltese and West Highland White Terriers, it can affect dogs of any size or color. GTS causes full-body tremors that are not related to temperature, emotion, or movement. Veterinary diagnosis and treatment are necessary to manage this condition.

Seizures

Seizures can look like severe shaking or trembling and are caused by abnormal electrical activity in the brain. They can be triggered by epilepsy, toxin ingestion, metabolic disorders, or brain abnormalities. During a seizure, a dog may fall to the side, paddle their legs, lose consciousness, or lose control of their bladder or bowels. Seizures are a veterinary emergency, and any dog that experiences one should be evaluated by a veterinarian as soon as possible.

Toxin Ingestion

If a dog ingests something toxic, shaking or trembling may be one of the first signs of poisoning. Common household toxins that can cause neurological symptoms in dogs include certain plants, medications, xylitol (found in sugar-free products), chocolate, and certain pesticides. If you suspect your dog has eaten something toxic, contact Broomfield Veterinary Hospital at 303-466-1764 or an animal poison control hotline immediately. Do not wait for symptoms to worsen.

Distemper

Canine distemper is a serious viral disease that, in its later stages, can cause neurological symptoms including muscle twitching and tremors. It most commonly affects unvaccinated puppies and young dogs. Distemper is preventable through vaccination, which is one of the most important reasons to stay current on your dog’s core vaccines. If your dog is showing neurological signs alongside respiratory or gastrointestinal symptoms, veterinary care is urgent.

What to Observe When Your Dog Is Shaking

When you notice your dog trembling, paying close attention to what’s happening around them and how they’re behaving can provide valuable information for your veterinarian. Here are some key things to observe:

• When the shaking started — Was there a triggering event, like a storm or a new food?
• How long the shaking lasts — Brief trembles after excitement are different from sustained shaking.
• Whether it affects the whole body or just one area — Localized trembling can indicate localized pain or neurological issues.
• Other symptoms present — Vomiting, lethargy, loss of appetite, or changes in behavior alongside shaking are important to note.
• Your dog’s recent activity — Did they eat something unusual, go somewhere new, or come into contact with any chemicals or plants?

Bringing this information to your veterinary appointment can help speed up the diagnostic process significantly.

Breeds More Prone to Shaking

While any dog can shake for any of the reasons listed above, certain breeds are more predisposed to trembling than others. Knowing your dog’s breed tendencies can give you additional context when assessing the situation.

• Chihuahuas — Known for shaking due to their small body size, high metabolism, and anxiety-prone temperament.
• Miniature Pinschers — Commonly tremble from excitement or cold.
• Italian Greyhounds — Thin-skinned and lean, making them very susceptible to cold-related shivering.
• Maltese and West Highland White Terriers — At higher risk for Generalized Tremor Syndrome.
• Toy and Miniature breeds — Generally more prone to hypoglycemia-related trembling.

When to See a Veterinarian for Dog Trembling

Not every instance of dog shaking requires an emergency vet visit, but some situations absolutely do. Knowing when to act quickly can make a real difference in your pet’s outcome.

You should contact your veterinarian promptly if your dog’s shaking:

• Comes on suddenly with no obvious cause
• Is accompanied by vomiting, diarrhea, or collapse
• Involves loss of consciousness or uncontrolled movements that look like a seizure
• Is paired with weakness, disorientation, or difficulty walking
• Happens after possible exposure to a toxin or unfamiliar food
• Persists for more than a few minutes without a clear emotional or environmental trigger

Err on the side of caution. When your dog is shaking and you’re not sure why, a call to the veterinary clinic is always the right move.

How a Veterinarian Diagnoses the Cause of Shaking

When you bring your dog in for shaking or trembling, your veterinarian will conduct a thorough physical examination and gather a detailed history of your dog’s symptoms, diet, environment, and recent activities. Depending on their findings, they may recommend additional diagnostic steps such as bloodwork to check glucose levels and organ function, urinalysis, neurological evaluation, or imaging studies. The goal is to identify the root cause of the trembling so that the most appropriate treatment plan can be put in place. Early diagnosis nearly always leads to better outcomes.

Your Dog’s Wellbeing Starts with Paying Attention

You know your dog better than anyone. When something feels off, including unexplained shaking, trusting your instincts and reaching out to a veterinary professional is the right call. At Broomfield Veterinary Hospital, we’re here to help Broomfield, CO pet owners get answers and peace of mind. Whether your dog’s trembling turns out to be a minor issue or something that needs treatment, our compassionate team is ready to help. Give us a call at 303-466-1764 or book an appointment online today because your dog deserves to feel their best.