Epilepsy in pets - Symptoms, diagnosis & treatment

Epilepsy is a major manifestation of brain disorders in pets. It occurs due to a sudden, uncontrolled discharge of nerve cells in the brain. This can lead to muscle twitching, loss of consciousness, or abnormal behavior. Epilepsy is the most common chronic brain disorder in dogs, but can also occur in cats. These seizures can be idiopathic (genetic/hereditary or without a clear cause), structural (brain abnormalities such as tumors, infections, trauma, vascular lesions), or reactive (metabolic or toxic disorders). 

In this article, we discuss the causes, symptoms, diagnosis, treatment, and prognosis of epilepsy in pets.

What is epilepsy?

Epilepsy is a condition in which recurrent seizures occur. We distinguish between idiopathic epilepsy, where no underlying cause is found, and epilepsy that results from a brain disorder such as a tumor, inflammation, infection, trauma, or metabolic disorders.

Which animals are at risk?

Idiopathic epilepsy occurs most often in dogs, with the first seizures usually occurring between 6 months and 6 years of age. Certain breeds, such as the Border Collie, Labrador Retriever, and German Shepherd, have a genetic predisposition to this condition. In cats, seizures are more often secondary to brain disorders such as infections (toxoplasmosis), trauma, or tumors.

Causes of epilepsy and seizures

The main causes are:

• Idiopathic, often hereditary
• Brain tumors
• Inflammation such as meningoencephalitis (autoimmune disease)
• Infections such as toxoplasmosis or FIP in cats
• Brain trauma
• Poisoning and metabolic disorders

Symptoms in dogs and cats

In dogs: classic generalized tonic-clonic seizures

• Sudden loss of consciousness
• Muscle twitching, stiffness, or cramping
• Excessive salivation, urination, or defecation during a seizure
• Disoriented or restless after the seizure (postictal phase)

In cats: focal seizures occur more frequently

• Often subtler signs such as staring, blinking, or sudden strange behavior
• But can also look exactly the same as in dogs

Diagnosis of epilepsy and brain disorders

The diagnosis is made through a combination of history taking, physical, and neurological examination. Additional tests are often needed to detect underlying brain disorders: blood tests, MRI, and cerebrospinal fluid analysis. In idiopathic epilepsy, no abnormalities are found. In structural epilepsy, brain abnormalities are often visible.

Treatments for epilepsy

Medication

The most commonly used medications are anti-epileptic drugs such as phenobarbital, imepitoin, potassium bromide, and levetiracetam. The goal is to reduce the frequency and severity of seizures. Complete seizure freedom is unfortunately rarely achieved.

Treatment of underlying brain disorders

If an underlying brain disease is present, treatment is tailored accordingly. This may involve surgery (for tumors), antibiotics or antiviral therapy (for infections), anti-inflammatory drugs (for autoimmune diseases), or even chemotherapy and radiation therapy.

Recovery and prognosis

The prognosis depends heavily on the cause. With idiopathic epilepsy, quality of life can often be well maintained with medication. For other forms of epilepsy, the prognosis depends on the nature of the underlying brain disorder.

Frequently asked questions (FAQ)

What is the difference between idiopathic and structural/reactive epilepsy?

Idiopathic epilepsy has no underlying cause, while structural epilepsy is caused by a brain disorder such as a tumor, infection, or metabolic disorder.

Do seizures occur more often in dogs or cats?

Dogs more often have idiopathic epilepsy, while cats usually have structural causes. Epilepsy is much rarer in cats than in dogs.

How is epilepsy diagnosed?

Through history taking, physical and neurological examination, and additional tests such as blood tests, MRI scans of the brain, and cerebrospinal fluid analysis.

Can epilepsy be cured?

Idiopathic epilepsy cannot be cured, but can often be well controlled with medication. For other forms of epilepsy, the prognosis varies greatly and is often less favorable because the structural cause takes precedence.