Seeing your older dog have a seizure can be an alarming and frightening experience. Seizures in senior dogs may indicate serious underlying medical issues, and understanding the potential causes is critical for providing timely care.
Early recognition and intervention can make a significant difference in your dog’s health and quality of life.
We outline the common causes of seizures in old dogs, what you can do at home, and when to seek veterinary help.
Old Dog Having Seizures — Why It Happens
Seizures in older dogs often result from a variety of medical conditions affecting the brain or body. These can range from metabolic disorders, brain tumors, kidney or liver dysfunction, to epilepsy or severe infections. Certain medications or toxins can also trigger seizures in senior dogs.
The frequency, duration, and type of seizure can provide clues about the underlying cause, making careful observation crucial.

Old Dog Having Seizures: Common Causes
Epilepsy
Epilepsy is a neurological disorder that can persist or emerge later in life. In senior dogs, epilepsy may present as sudden, uncontrolled shaking, loss of consciousness, or unusual behavior.
Owners may notice pre-seizure signs, such as restlessness or anxiety. While often manageable with medication, epilepsy requires ongoing monitoring and veterinary care to prevent injury.
Read more: Old Dog Going in Circles (Here’s why)
Brain Tumors
Brain tumors are a common cause of seizures in older dogs. Tumors can disrupt normal brain activity, leading to sudden convulsions, disorientation, or behavioral changes.
Other signs may include head tilting, circling, or vision problems. Early detection is vital, as treatment options may include surgery, medication, or palliative care depending on the tumor type.
Liver Disease
Severe liver disease or hepatic encephalopathy can provoke seizures. Toxins that are normally filtered by a healthy liver build up in the bloodstream when the liver fails, affecting the brain.
Symptoms may include confusion, drooling, vomiting, and sudden convulsions. Timely veterinary assessment and management are critical to prevent further complications.
Kidney Failure
Advanced kidney disease can also trigger seizures in senior dogs. Toxin accumulation from impaired kidney function can interfere with normal brain activity, causing convulsions.
Signs of kidney issues often include increased thirst, urination, weight loss, and lethargy.
Addressing kidney disease promptly can reduce seizure frequency and improve quality of life.
Low Blood Sugar (Hypoglycemia)
Hypoglycemia is a sudden drop in blood sugar that can lead to seizures. Older dogs with diabetes, malnutrition, or other metabolic disorders are at higher risk.
Symptoms may include weakness, disorientation, trembling, or sudden collapse. Immediate veterinary intervention is necessary to stabilize blood sugar levels and prevent recurrent episodes.
Toxin Exposure
Certain toxins, foods, or medications can provoke seizures in senior dogs. Exposure to substances such as antifreeze, chocolate, or prescription drugs in incorrect doses can affect brain function.
Owners may notice vomiting, drooling, uncoordinated movements, or convulsions. Identifying and removing the toxin quickly, along with veterinary treatment, is essential to prevent lasting harm.
What to Do If Your Old Dog Is Having Seizures
Ensure your dog is in a safe environment during a seizure by removing objects that could cause injury. Avoid restraining your dog’s movements but protect their head and limbs from hitting hard surfaces.
Keep a detailed record of each seizure, including the time, duration, and behaviors observed. This information is invaluable for your veterinarian to determine patterns and potential causes.
Provide supportive care after a seizure, including a calm, quiet space for recovery, access to water, and gentle reassurance. Post-seizure confusion is common and may last several minutes to an hour.
Maintain regular veterinary checkups and discuss any changes in behavior, appetite, or health that could indicate an underlying condition. Appropriate treatment plans may include medication, diet adjustments, or lifestyle modifications.
Monitor your dog’s overall health and ensure proper nutrition, hydration, and stress reduction, which can help reduce seizure frequency and severity.
When to Call or Visit Your Vet
Seek immediate veterinary care if a seizure lasts longer than five minutes or if multiple seizures occur within a short period.
Seizures accompanied by difficulty breathing, bleeding, persistent vomiting, or extreme lethargy require urgent attention.
Any first-time seizure, sudden behavioral changes, or signs of disorientation in a senior dog should be evaluated promptly. Early diagnosis can be life-saving and help manage the underlying cause effectively.
Read more: Old Dog Lethargic and Not Eating (Here’s Why)
Key Takeaway
Seizures in older dogs can stem from neurological disorders, organ dysfunction, metabolic imbalances, or toxin exposure.
Observing your dog closely, maintaining a safe environment, and seeking timely veterinary care are crucial steps in managing this condition.
While witnessing a seizure is frightening, understanding the potential causes and acting promptly can greatly improve your dog’s safety and quality of life.
With proper care, medication, and support, many senior dogs can continue to enjoy their golden years comfortably and safely.