Dog Diarrhea and Shaking: Possible Causes and When to Get Help
Diarrhea accompanied by shaking or trembling in a dog can signal discomfort from several different causes, and recognizing the context and severity of these signs can help you decide on the right course of action.
Quick Answer
Shaking alongside diarrhea in dogs can result from abdominal pain, dehydration, fever, electrolyte imbalance, low blood sugar, toxin exposure, or anxiety. Some causes are mild and self-limiting, while others require urgent veterinary attention. Observe your dog closely for additional signs such as vomiting, lethargy, pale gums, or collapse, and contact a veterinarian if shaking is severe or persistent.
SYMPTOM TRIAGE
Answer a few questions about your dog's signs and receive general guidance on how urgently to seek veterinary care.
This tool does not diagnose conditions or replace a veterinarian.
Possible Reasons Your Dog Has Diarrhea and Is Shaking
Shaking in dogs can have many origins. When it occurs together with diarrhea, several explanations are worth understanding.
Abdominal pain or cramping. Gastrointestinal irritation from infections, dietary indiscretion, or inflammation can cause abdominal discomfort. Dogs may tremble or adopt a hunched posture in response to cramping. This type of shaking is sometimes intermittent and may coincide with episodes of diarrhea.
Dehydration. Diarrhea causes the body to lose fluids and electrolytes rapidly. Even over a short period, this fluid loss can lead to dehydration, which may manifest as weakness, trembling, and lethargy. Puppies, small-breed dogs, and senior dogs are particularly susceptible to rapid dehydration.
Fever. An elevated body temperature from an infection can cause shaking or chills in dogs, similar to how people may shiver with a fever. Gastrointestinal infections caused by bacteria, viruses, or other pathogens can produce both fever and diarrhea.
Electrolyte imbalance. When diarrhea is frequent, the body loses essential electrolytes such as potassium, sodium, and chloride. These minerals play a critical role in muscle function, and an imbalance can result in muscle tremors or generalized shaking.
Hypoglycemia. Low blood sugar can cause trembling, weakness, and in severe cases, seizures. Diarrhea may reduce appetite or interfere with nutrient absorption, which can lower blood glucose levels. This is more common in small breeds, young puppies, and dogs with metabolic conditions such as diabetes.
Toxin exposure. Ingestion of toxic substances, including certain foods (grapes, chocolate, xylitol), plants, chemicals, or inappropriate medications, can cause gastrointestinal distress along with neurological signs such as trembling, shaking, or seizures. Toxin exposure is a veterinary emergency.
Anxiety or stress. Some dogs shake in response to stress or fear. If the diarrhea began after a stressful event such as boarding, travel, a change in routine, or loud noises, anxiety may be a contributing factor. However, it is important to rule out physical causes before assuming the shaking is purely behavioral.
What to Observe and Document
Noting the details of your dog's behavior and physical condition can help a veterinarian assess the situation more effectively. Pay attention to the following:
- Type of shaking: Is it a full-body tremor, localized to the legs, or intermittent shivering? Does it stop when the dog rests or is it continuous?
- Timing: Does the shaking occur before, during, or after diarrhea episodes? Is it worse at particular times of day?
- Gum color and moisture: Pale, dry, or tacky gums can indicate dehydration or shock. Normal gums are pink and moist.
- Skin elasticity: Gently lift the skin on the back of the neck. If it does not spring back quickly, this may suggest dehydration.
- Vomiting: The presence of vomiting alongside diarrhea and shaking can accelerate dehydration and may suggest a more systemic illness.
- Alertness and responsiveness: A dog that is difficult to rouse or seems disoriented may be experiencing a more serious condition such as toxin exposure, severe electrolyte disturbance, or hypoglycemia.
- Possible exposures: Consider whether your dog may have accessed garbage, unfamiliar food, chemicals, plants, or medications.
When This Combination May Be an Emergency
Some situations involving diarrhea and shaking require immediate veterinary attention. Seek emergency care without delay if you observe any of the following:
- The shaking is severe, continuous, or progressing to seizures or collapse
- Your dog's gums are pale, white, blue-tinged, or dry and tacky
- Your dog is non-responsive, very weak, or unable to stand
- There is bloody diarrhea or diarrhea that appears black and tarry
- You suspect or know that your dog has ingested a toxic substance
- Your dog has not eaten or had water in more than 12 to 24 hours
- Your dog is a puppy, a small-breed adult, or a senior dog with pre-existing conditions
When in doubt, it is safer to have a veterinarian evaluate your dog. Waiting to see if signs improve can allow a treatable condition to become more serious.
When to Contact a Veterinarian
Even in the absence of emergency indicators, a veterinary consultation is appropriate when your dog has diarrhea combined with shaking that lasts more than a few hours or is happening repeatedly. A veterinarian can perform a physical examination, assess hydration status, and run diagnostic tests such as blood work, fecal analysis, or toxin screens as needed.
Contact your veterinarian the same day if your dog is shaking and has diarrhea, especially if the dog is a puppy, a toy breed, or has known health conditions that could be affected by fluid loss or metabolic changes.
Frequently Asked Questions
Can a dog shake from diarrhea alone, without another underlying cause?
Frequent diarrhea can lead to fluid loss and electrolyte imbalance, which may cause trembling even without a separate illness. However, shaking that is pronounced or persistent should be evaluated by a veterinarian to rule out additional causes such as pain, fever, or toxin exposure.
Should I offer my dog food if they have diarrhea and are shaking?
Withholding food for 12 to 24 hours can sometimes give the gastrointestinal tract a rest, provided the dog continues to drink water. However, this approach depends on the individual dog and the suspected cause, so it is best to consult a veterinarian before making dietary changes, especially for puppies or dogs with existing conditions.
Can anxiety cause both diarrhea and shaking in dogs?
Stress and anxiety can cause gastrointestinal upset and trembling in some dogs. If there is a clear stressful trigger and the dog has no other physical signs such as vomiting, pale gums, or lethargy, anxiety may be a factor. A veterinarian can help determine whether the signs are behavioral or have a medical basis.
What toxins commonly cause shaking and diarrhea in dogs?
Several substances can produce these signs, including chocolate, xylitol (a sugar substitute), grapes and raisins, certain plants, rodenticides, medications intended for humans, and household chemicals. If you suspect toxin exposure, contact a veterinarian or a veterinary poison control hotline immediately.
SYMPTOM TRIAGE
If your dog has diarrhea and is shaking, the symptom triage tool can help you determine whether you should seek veterinary care right away or schedule a same-day appointment.
Sources
- Twedt, D.C. (2020). Acute Gastroenteritis in Dogs. Veterinary Clinics of North America: Small Animal Practice, 50(5), 857-872.
- Peterson, M.E. (2021). Toxicology Emergencies. In Small Animal Emergency and Critical Care Medicine (2nd ed.). Elsevier.
- Rozanski, E.A. & Rush, J.E. (2020). Emergency Evaluation of the Dog with Gastrointestinal Signs. Journal of Veterinary Emergency and Critical Care, 30(1), 15-28.
- ASPCA Animal Poison Control Center. Common Canine Toxins and Clinical Presentations, 2024.
This article and the PawAI Symptom Triage tool provide general educational information only. They cannot examine your pet, make a diagnosis, or replace advice from a licensed veterinarian. Contact a veterinarian promptly if symptoms are severe, worsening, persistent, or accompanied by emergency warning signs.