Why Do Dogs Have Seizures?
QUICK ANSWER
Dogs have seizures when abnormal electrical activity disrupts the brain. The most common cause is idiopathic epilepsy (epilepsy with no identifiable underlying cause), but seizures can also result from toxin exposure, liver disease, brain tumors, infections, or low blood sugar.
Watching your dog have a seizure is one of the scariest things a pet owner can experience. It helps to understand what's happening, what causes it, and what you can actually do to help. The good news is that many dogs with seizure disorders live normal, full lives with proper management.
What causes seizures in dogs?
The most common cause in dogs between 1 and 5 years old is idiopathic epilepsy, which means the seizures happen without an identifiable structural or metabolic cause. According to the American College of Veterinary Internal Medicine, idiopathic epilepsy is thought to have a genetic component and is more common in certain breeds including Labrador Retrievers, Golden Retrievers, German Shepherds, Beagles, and Border Collies. Other causes include toxin ingestion (xylitol, chocolate, certain plants, rodenticides), liver or kidney disease, brain tumors (more common in older dogs), infections like distemper, head trauma, and metabolic issues like low blood sugar.
What does a seizure look like?
A generalized (grand mal) seizure typically involves the dog falling to their side, becoming stiff, and then paddling their legs involuntarily. They may drool, urinate, defecate, or vocalize. Their eyes may be wide open and unfocused. Most generalized seizures last between 30 seconds and 2 minutes. Focal seizures are more subtle and may involve twitching on one side of the face, one limb jerking, or unusual repetitive behaviors. Some dogs experience a pre-seizure phase (called the "aura") where they seem restless, clingy, or disoriented in the minutes before the event.
What should you do during a seizure?
Stay calm and keep your hands away from your dog's mouth; dogs don't swallow their tongues, but they can involuntarily bite during a seizure. Move any nearby objects that could hurt them, note the time the seizure started, and time how long it lasts. Don't try to restrain your dog or put anything in their mouth. Most seizures are self-limiting and will stop on their own. After the seizure ends, your dog may be confused, wobbly, temporarily blind, or extremely tired for minutes to hours (this is the "post-ictal" phase and it's normal).
When is a seizure an emergency?
A single, brief seizure in an otherwise healthy dog is worth reporting to your vet but isn't usually an emergency. However, you should seek immediate veterinary care if a seizure lasts longer than 5 minutes, if your dog has multiple seizures in a 24-hour period (cluster seizures), if they don't fully recover between seizures, or if it's their very first seizure and you don't know the cause. Status epilepticus (a seizure that doesn't stop on its own) is a life-threatening emergency that requires immediate intervention. If you're unsure, call your vet or an emergency clinic.
Seizures are frightening to witness, but understanding what's happening makes it easier to respond effectively. Many seizure disorders in dogs are manageable with medication and regular veterinary monitoring. If your dog has a seizure for the first time, get them evaluated so your vet can determine the cause and build a plan from there.
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