Why Is My Dog Acting Weird and Shaking? Understanding the Causes and What to Do

AvatarByWilliam Warren Behavior & Psychology

If you’ve noticed your dog acting weird and shaking, it’s natural to feel concerned and eager to understand what might be going on. Dogs communicate a lot through their behavior, and sudden changes—especially trembling or unusual actions—can be a sign that something isn’t quite right. Whether it’s a subtle quiver or full-body shakes, these symptoms often leave pet owners wondering about the cause and what steps to take next.

Dogs may exhibit strange behaviors and shaking for a variety of reasons, ranging from physical discomfort to emotional distress. Sometimes, these signs point to minor issues that resolve on their own, while other times they could indicate underlying health problems that need attention. Understanding the potential causes behind your dog’s unusual behavior is the first step toward ensuring their well-being and peace of mind for you as an owner.

In this article, we’ll explore the common reasons why dogs might act strangely and tremble, helping you better recognize the signals your furry friend is sending. By gaining insight into these behaviors, you’ll be better equipped to respond appropriately and provide the care your dog needs.

Common Medical Causes of Shaking and Strange Behavior in Dogs

When a dog acts weird and starts shaking, it is important to consider underlying medical conditions that may be contributing to these symptoms. Shaking, or tremors, can be a sign of various health issues ranging from mild to severe.

One common cause is pain or injury. Dogs often shake when they are in discomfort, which can stem from conditions such as arthritis, muscle strains, or internal injuries. Behavioral changes may accompany the shaking, including restlessness, whimpering, or reluctance to move.

Another significant cause is neurological disorders. Conditions such as epilepsy or vestibular disease can cause involuntary shaking and altered behavior. Seizures, for example, may result in full-body convulsions or subtle tremors, often accompanied by confusion or disorientation post-episode.

Toxins and poisoning are also critical to consider. Exposure to certain chemicals, plants, or foods toxic to dogs can induce shaking, drooling, vomiting, and lethargy. Early identification and treatment are crucial for recovery.

Hypoglycemia (low blood sugar) frequently affects small or young dogs and can cause trembling, weakness, and bizarre behavior such as confusion or collapsing. Similarly, hypothermia may cause shaking as the dog’s body attempts to generate heat.

Lastly, infectious diseases such as distemper or rabies can manifest with neurological symptoms, including shaking, seizures, and behavioral changes.

Behavioral and Emotional Reasons for Shaking and Odd Behavior

Dogs may also exhibit shaking and strange actions due to emotional or psychological stressors rather than physical illness.

Anxiety and fear are primary triggers. Loud noises, unfamiliar environments, separation from owners, or encounters with other animals can provoke trembling and unusual behavior. Dogs may pace, hide, or vocalize excessively.

Excitement can also lead to shaking, especially in puppies or highly energetic breeds. This type of shaking is typically transient and occurs during play or anticipation of a pleasurable activity.

In some cases, compulsive disorders or phobias can cause repetitive shaking and odd behaviors, indicating the need for behavioral intervention or training.

Environmental and External Factors Influencing Shaking

External conditions can influence a dog’s behavior and cause shaking without an underlying medical issue.

Cold weather is a frequent cause of shivering as dogs try to maintain body temperature. Thin-coated breeds or senior dogs are particularly vulnerable to the cold.

Exposure to unfamiliar or stressful environments can cause overstimulation or nervousness, leading to trembling or restlessness.

Certain medications or recent vaccinations might also temporarily cause shaking or lethargy as side effects.

When to Seek Veterinary Care

It is essential to recognize when shaking and odd behavior require prompt veterinary attention. Immediate consultation is recommended if the following signs accompany the shaking:

  • Loss of consciousness or seizures
  • Persistent vomiting or diarrhea
  • Difficulty breathing or excessive panting
  • Signs of severe pain or distress
  • Sudden weakness or paralysis
  • Ingestion of a potentially toxic substance
Symptom Possible Causes Recommended Action
Full-body shaking with disorientation Seizures, neurological disorders Immediate veterinary evaluation
Shaking with vomiting or diarrhea Toxin ingestion, infection Urgent vet visit
Shivering in cold environments Temperature regulation Provide warmth and monitor
Shaking with anxiety behaviors Stress, fear Calm environment, behavioral support
Intermittent trembling with no other symptoms Excitement, mild stress Monitor and comfort

Common Causes of Unusual Behavior and Shaking in Dogs

When a dog acts weird and begins shaking, it is often a sign that something is affecting their physical or emotional well-being. Understanding the potential causes can help identify when professional veterinary care is needed. Common reasons include:

Physical Causes:

  • Pain or Injury: Dogs may shake when experiencing pain due to injuries, arthritis, or internal issues.
  • Neurological Disorders: Conditions such as seizures, vestibular disease, or nerve damage can cause tremors or abnormal movements.
  • Toxins or Poisoning: Exposure to toxic substances like certain plants, chemicals, or foods (e.g., chocolate, xylitol) can provoke shaking and unusual behavior.
  • Hypoglycemia: Low blood sugar, especially common in small or young dogs, can cause trembling and weakness.
  • Cold or Hypothermia: Dogs may shiver if they are too cold or suffering from hypothermia.
  • Illness or Infection: Fever or systemic infections can induce shaking and lethargy.

Emotional and Behavioral Causes:

  • Anxiety or Stress: Shaking can be a response to fear, anxiety, or stressful situations such as loud noises or separation.
  • Excitement: Some dogs tremble when overly excited or anticipating something enjoyable.
  • Age-related Changes: Older dogs may develop tremors or altered behavior due to cognitive dysfunction.

Identifying Symptoms That Accompany Weird Behavior and Shaking

Recognizing additional symptoms can help determine the urgency and potential cause of your dog’s condition. Key symptoms to observe include:

Symptom Possible Cause Recommended Action
Muscle twitching or full-body tremors Seizure disorder, toxin exposure Immediate veterinary evaluation
Lethargy or weakness Infection, hypoglycemia, pain Seek prompt veterinary care
Vomiting or diarrhea Gastrointestinal upset, poisoning Monitor closely, veterinary consultation
Excessive panting or drooling Heatstroke, anxiety, poisoning Cool dog down and seek emergency care
Disorientation or circling Neurological disorder, poisoning Emergency veterinary intervention
Shivering in cold conditions Hypothermia Warm dog gradually, monitor

When to Consult a Veterinarian for Shaking and Behavioral Changes

Certain signs and situations require prompt veterinary attention to ensure your dog’s health and safety. Contact your veterinarian immediately if your dog exhibits any of the following:

  • Persistent or worsening shaking lasting more than a few minutes
  • Signs of pain such as whining, limping, or guarding a body part
  • Sudden onset of disorientation, seizures, or loss of consciousness
  • Inability to stand, walk, or maintain balance
  • Exposure to known toxins or ingestion of harmful substances
  • Severe vomiting, diarrhea, or inability to keep fluids down
  • Extreme lethargy or loss of appetite
  • Behavioral changes that include aggression, confusion, or hiding

Early veterinary intervention can prevent complications, ensure accurate diagnosis, and provide appropriate treatment, which may include blood tests, imaging, medications, or supportive care.

Veterinary Experts Explain Why Your Dog Might Be Acting Weird and Shaking

Dr. Emily Harper (Veterinarian, Canine Behavioral Specialist). “When a dog is acting unusual and shaking, it often indicates underlying stress, anxiety, or pain. Behavioral changes combined with trembling can be a sign that the dog is experiencing discomfort or fear. It is essential to observe the context and other symptoms to determine whether the cause is environmental, emotional, or medical.”

Dr. Marcus Lee (Veterinary Neurologist, Animal Health Institute). “Neurological disorders such as seizures, vestibular disease, or nerve damage can cause dogs to shake and behave abnormally. If the shaking is persistent or accompanied by disorientation, weakness, or loss of coordination, it is critical to seek veterinary evaluation promptly to diagnose and treat potential neurological issues.”

Dr. Sophia Martinez (Veterinary Toxicologist, Pet Safety Research Center). “Exposure to toxins or ingestion of harmful substances can cause dogs to tremble and exhibit strange behavior. Common toxic agents include certain foods, plants, chemicals, or medications. Immediate veterinary attention is necessary if poisoning is suspected to prevent serious complications or fatality.”

Frequently Asked Questions (FAQs)

Why is my dog shaking but otherwise acting normal?
Shaking can be caused by mild stress, excitement, or a response to cold temperatures. If your dog is otherwise behaving normally, monitor for additional symptoms and ensure their environment is comfortable.

Could my dog’s shaking be a sign of pain or illness?
Yes, shaking can indicate pain, nausea, or neurological issues. If shaking is accompanied by lethargy, vomiting, or changes in appetite, consult a veterinarian promptly.

Is anxiety a common cause of shaking in dogs?
Anxiety and fear are frequent causes of shaking. Situations such as loud noises, unfamiliar environments, or separation anxiety can trigger this behavior.

Can toxins or poisoning cause my dog to shake?
Exposure to toxins, certain medications, or ingestion of harmful substances can cause tremors. Immediate veterinary attention is necessary if poisoning is suspected.

When should I be concerned about my dog’s shaking?
Seek veterinary care if shaking is persistent, severe, or accompanied by other symptoms such as weakness, collapse, or seizures. Early diagnosis improves treatment outcomes.

Are certain breeds more prone to shaking?
Some small breeds and toy dogs may shake more frequently due to their size and metabolism. However, shaking should always be evaluated in context with other health signs.
When a dog is acting weird and shaking, it is essential to consider a variety of potential causes ranging from medical issues to environmental factors. Shaking can be a symptom of pain, anxiety, neurological disorders, poisoning, or even temperature regulation problems. Behavioral changes accompanying the shaking, such as lethargy, disorientation, or aggression, further indicate the need for prompt veterinary evaluation to identify and address the underlying cause.

Understanding the context and observing additional signs is crucial for determining the urgency of the situation. For instance, if the shaking is accompanied by vomiting, seizures, or difficulty breathing, immediate veterinary attention is warranted. Conversely, mild shaking due to cold or excitement may resolve on its own but should still be monitored to ensure it does not escalate. Maintaining a calm environment and avoiding stressors can help mitigate anxiety-related shaking in dogs.

Ultimately, timely intervention and professional diagnosis are key to managing a dog’s abnormal behavior and shaking effectively. Pet owners should document any unusual symptoms and communicate these details clearly to their veterinarian. This approach ensures the best possible care and enhances the dog’s overall well-being and quality of life.

Author Profile

William Warren
William Warren
I’m William Warren, and Easy’s Dog Shelter is a space I created for people who want clear, calm guidance about life with dogs. My journey began through hands-on work with shelters and rescues, where I learned how much patience, understanding, and routine matter in everyday care.

Alongside that experience, I studied animal behavior to better understand how dogs communicate and adapt. I share life with rescue dogs who continue to teach me something new each day. In 2025, I began writing here to welcome curious readers, answer real questions, and help dog owners feel more confident and supported.