This article was updated on October 5th, 2026
There are many possible causes of seizures, and some are more manageable than others. Some dogs with seizures can live long and happy lives and have normal lifespans. However, the medical conditions causing the seizures may also get worse over time – resulting in more frequent or more intense seizures.
In this article, our veterinarians Dr. Alex Crow & Dr. Jamie Whittenburg explain life expectancy for different types of seizures and share when euthanasia is the best option.
Key highlights:
– Seizures that last over 5 min or occur more than 2-3 times within 24 hours can be immediately life threatening
– Dogs with well-controlled idiopathic epilepsy may live normal lifespans
– Seizures in dogs can be caused by many conditions, such as cancer, or liver and kidney disease. This article explains life expectancy for 8 different conditions
– If your dog continues to have uncontrolled seizures daily or weekly, humane euthanasia is often one of the kindest things you can do for them
Frequent or long seizures can be immediately life threatening
The frequency and length of seizures will have a huge impact on your dog’s prognosis and life expectancy. Seizures that last over 5 minutes or occur more than 2-3 times within 24 hours can be immediately life threatening as the blood and energy supply to the bain is cut off. Therefore, these situations are an emergency, and your dog should be seen by a veterinarian immediately.
How long can a senior dog live after seizures?
On the other hand, dogs with well-controlled idiopathic epilepsy can live long and happy lives: dogs with idiopathic epilepsy have an estimated survival time of about 66 months (5.5 years) according to this study, if seizures are properly controlled. Our Veterinarian Director Dr. Whittenburg explains:
Vet Insight
“With the newer medications that have fewer side effects and cause less strain on the liver, I believe a dog with well-controlled idiopathic epilepsy should be expected to live a normal lifespan.”
Dr. Whittenburg adds however that “uncontrollable epileptic seizures, or the need for medications that tend to have more negative effects on the liver, such as phenobarbital, may potentially shorten the expected lifespan.” The veterinary Center for University of Missouri estimates that “60-70 percent of epileptic dogs achieve good seizure control when their therapy is carefully monitored.”
If seizures are occurring due to a brain lesion such as a tumor, then the median survival time will be dramatically reduced to closer to 8 months.
It is therefore crucial to determine the cause of seizures and to start your dog on medication if necessary. In the next section, we will look at the most frequent conditions causing seizures in dogs, and their impact on life expectancy.
Most frequent conditions causing seizures (with life expectancy information for each)
Dogs of all ages and breeds can experience seizures for different causes. Here are 8 of the most common causes, including information on life expectancy and euthanasia:
1. Liver Disease
Liver disease or failure in senior dogs can cause seizures, but other symptoms usually appear first, including loss of appetite, abdominal swelling, or digestive upsets (vomiting, diarrhea, or constipation).
Life expectancy: Dogs with liver disease can have a variable life expectancy depending on the underlying cause of the disease: some liver diseases are slowly progressive such as chronic hepatitis whereas other forms of liver disease progress much faster such as liver cancer. Because of this, the life expectancy for a dog with liver disease can range from months to years.
When it is time to consider euthanasia: If your dog is obviously very unwell and having seizures on a regular basis such as multiple seizures every week, it’s likely time to consider euthanasia.
2. Kidney Disease
Kidney disease or failure in older dogs can lead to toxin buildup in the bloodstream, causing seizures. Usually, seizures or comas only occur in advanced stages of the disease.
Life expectancy: The life expectancy of dogs with kidney disease will depend on the stage of kidney failure they are in. Seizures will usually only occur in very late-stage renal failure; this is described as stage 4 kidney disease and the medial survival time for dogs in this category is between 14-80 days according to the international renal interest society (IRIS).
When it is time to consider euthanasia: Dogs in stage 4 renal failure are likely to be very unwell and so euthanasia may be in their best interests, especially if they are losing weight, vomiting, and having regular seizures.
3. Cancer
A brain tumor can cause seizures as well as other neurological symptoms. A cancer that starts off in another part of the body can metastasize (spread) to other parts of your dog’s body, including the brain, and cause similar problems.
Life expectancy: The life expectancy of dogs with brain tumors will vary depending on the type of cancer present and the speed at which it progresses. However, in many cases, the prognosis is poor. Without treatment, survival can be short, typically weeks to months. Treatment options like surgery, radiation, and chemotherapy can extend survival to several months to a year or more.
When it is time to consider euthanasia: Treatment may be able to extend this period but often not by much. If your dog is displaying neurological symptoms other than seizures such as incoordination, confusion, and an inability to walk properly, then it’s time to consider euthanasia. Having your dog euthanized is also recommended if your dog is having multiple seizures a week that cannot be controlled with medication.
4. Diabetes
Dogs with extreme diabetes can enter a state known as diabetic ketoacidosis. This results in electrolyte disturbances within the blood and seizures may follow. It’s also possible for seizures to occur as a result of overtreating diabetes – they could have a seizure if they develop hypoglycemia because of accidentally receiving too much insulin.
Life expectancy: The general median survival time for dogs with diabetes left untreated is 60 days. Treated and controlled diabetics may live full life spans. However, if your dog is having seizures or displaying other unusual neurological activity, then they are likely in a much later stage of the disease (See our article on the Final Stages of Diabetes). Take your dog to the vet immediately as prompt treatment may be able to reverse the seizures.
When it is time to consider euthanasia: If your dog has been having seizures for a while, and their diabetes is getting more difficult to control then euthanasia may be an option. Learn more in our article Signs that Your Dog May be Dying from Diabetes.
5. Hypoglycemia
Hypoglycemia is a condition where the blood sugar level in your dog drops significantly. This can lead to seizures or coma, which are the most severe consequences of hypoglycemia.
Life expectancy: Most causes of hypoglycemia can be easily reversed through veterinary treatment. However, in some cases where there is a more serious underlying cause, the prognosis might be poorer.
When it is time to consider euthanasia: If your dog keeps experiencing seizures despite veterinary intervention, then euthanasia might be in their best interests.
Related articles about dog seizures:
Can Seizures Be Fatal to Dogs?
Best Food for Dogs with Seizures
6. Adverse Reaction to Medication
All medications (and also, to a lesser degree, natural remedies) can have side effects. Many are mild and can include vomiting, diarrhea, and reduced appetite. Other severe reactions are less common, but definitely do happen. Seizures in dogs can be one fairly rare, but serious, side effect of certain medications.
7. Environmental Toxins
There are several things in our dog’s environment that can potentially cause seizures. These include:
- Rodent poison
- Antifreeze
- Insecticides
- Garden weedkiller
- Insect poisons
- Lead paint
- Black mold
Vet Insight
“You may not even know that things like black mold, or lead paint are in your home. If your dog has unexplained seizures, having your ductwork and heating/ac and any old paintwork checked out is a good idea. Blood tests can determine lead levels too.”
8. Trauma or Injury
An injury to the brain can cause a seizure in dogs of any age. Older dogs are more prone to falling than younger ones, and a fall down some steps resulting in a blow to the head could cause brain damage or bleeding. If your dog shows any signs of illness, strokes, or seizures after falling or injuring himself (even if you didn’t see them hit their head), take them to be examined by a veterinarian asap.
You may consider humane euthanasia if your dog experiences daily or weekly seizures
Whether your dog has had one seizure or multiple, they are never considered normal. If your dog presents with seizures alone or seizures with other symptoms, seek veterinary help immediately. Your vet can run tests to determine the cause of their seizures and see if treatment options exist to ease their suffering.
While making the decision to euthanize your pet is an extremely difficult one, watching them suffer is something no owner wants to experience. Seizures are very distressing for both you and your dog, and they are likely to feel very disorientated between episodes, as Dr. Crow explains:
Vet Insight
“Seizures are very distressing for both you and your dog. Dogs are likely to feel very disorientated between episodes. Seizures are never normal, and if they are occurring on a frequent basis, veterinary attention is required.”
If your dog is having uncontrolled daily or weekly seizures due to an illness, disease, or accident, often the kindest thing is to have them humanely euthanized. As heart-breaking as it can be to say goodbye to our pets, you can help end their suffering in the most pain-free way possible.
Final Words
While making the decision to euthanize your pet is an extremely difficult one, watching them suffer is something no owner wants to experience.
If your dog continues to seize on a weekly or even daily basis then it is not fair to keep them alive; often the kindest thing is to have them humanely euthanized.
Author
Disclaimer: This website's content is not a substitute for veterinary care. Always consult with your veterinarian for healthcare decisions. Read More.
