A dog seizure is one of the scariest things you can watch happen to your pet, and there’s a reason it feels so alarming: for 30 to 90 seconds, your dog’s brain is misfiring and they have no control over their body. The short version — most seizures look worse than they are, a single short seizure is rarely a same-night emergency, but a seizure lasting more than five minutes, or three or more seizures in 24 hours, is a genuine emergency that needs a vet immediately.
Here’s what’s actually happening, what causes it, what to do in the moment, and when “wait and watch” stops being the right call.
What a Seizure Actually Looks Like
Seizures in dogs don’t always look like the full-body, legs-paddling collapse most people picture. The American College of Veterinary Internal Medicine (ACVIM) consensus guidelines on canine epilepsy describe several patterns, and it helps to know the range:
- Generalized (grand mal) seizures — your dog falls to their side, legs paddle or go rigid, and they may lose bladder or bowel control. This is the most recognizable type.
- Focal seizures — twitching in one part of the face or a limb, sometimes with strange behavior like snapping at invisible flies or unexplained lip-smacking. These are easy to miss or misread as odd behavior rather than a neurological event.
- Pre-seizure (aura) phase — some dogs get restless, clingy, or anxious minutes before it starts. Owners who know their dog’s pattern sometimes catch this.
- Post-seizure (postictal) phase — after the seizure stops, dogs are often disoriented, temporarily blind, wobbly, or ravenously hungry for anywhere from a few minutes to 24 hours. This part can look alarming on its own, but it’s the recovery, not a second event.
What Causes Seizures in Dogs
Seizures are a symptom, not a diagnosis — they’re what happens when a group of neurons in the brain fires abnormally. The underlying cause varies a lot by age:
Idiopathic epilepsy is the most common cause in dogs between 1 and 5 years old, and it means no structural cause can be found — the brain looks normal on imaging, but it seizes anyway. Certain breeds (Border Collies, Labrador Retrievers, Beagles, and German Shepherds among them) have a higher documented rate, suggesting a genetic component that researchers are still mapping.
In dogs under a year old, seizures are more often linked to congenital conditions, infection, or low blood sugar in toy breeds. In dogs over 5, a new-onset seizure is more likely to point to a structural problem — a brain tumor, stroke, or the after-effects of an injury — which is why vets take first-time seizures in older dogs more seriously than the same event in a 3-year-old.
Other causes worth knowing about because they’re preventable or treatable:
- Toxins — xylitol, chocolate, certain rodenticides, and some human medications can trigger seizures
- Liver or kidney disease — toxin buildup in the blood can affect the brain
- Low blood sugar (hypoglycemia) — more common in small-breed puppies and dogs with diabetes on insulin
- Electrolyte imbalances
- Infections affecting the brain, including some that vaccination protects against — see our guide to essential dog vaccines for what’s covered and why timing matters
What to Do During a Seizure
You cannot stop a seizure once it starts, and trying to restrain your dog or put your hands near their mouth will only get you bitten — dogs aren’t aware of what they’re doing mid-seizure. What you can do:
- Time it. Pull out your phone and start a timer the moment it begins. This single detail matters more than almost anything else you can do — it tells you and your vet whether this is an emergency.
- Clear the area. Move furniture, stairs, or anything your dog could fall against or off of.
- Don’t put anything in their mouth. The old advice about dogs “swallowing their tongue” during a seizure is a myth — dogs cannot swallow their tongue, and trying to hold their mouth open risks a serious bite.
- Dim the lights and lower the noise if you can. Sound and light can prolong or intensify a seizure in some dogs.
- Stay nearby and talk calmly once it passes. Your dog will likely be disoriented and may not recognize you right away — that’s normal in the postictal phase.
When to See a Vet
Call your vet — the same day, not “eventually” — after any first-time seizure, even a short one. It’s the only way to start ruling out causes and to establish a baseline.
Treat it as an emergency and go to an ER vet immediately if:
- The seizure lasts longer than 5 minutes (this is called status epilepticus and requires urgent treatment — it can cause dangerous overheating and brain damage the longer it continues)
- Your dog has more than one seizure within a 24-hour period (cluster seizures)
- Your dog doesn’t fully regain normal consciousness between seizures
- This is a new seizure in a dog over 5 years old, especially if paired with other symptoms like circling, vision changes, or personality shifts, which can point to a structural cause including cognitive decline — our piece on dog dementia and cognitive decline covers overlapping signs worth ruling out
- Your dog’s breathing looks labored or their gums turn blue or very pale after the seizure ends
If your dog has recurring seizures, your vet will likely recommend bloodwork to rule out metabolic causes, and depending on age and pattern, possibly imaging (MRI) and a spinal tap to rule out structural or infectious causes. Dogs diagnosed with idiopathic epilepsy typically start daily anti-seizure medication once they’ve had two or more seizures within a six-month window, or after a single severe cluster — this is a vet decision based on frequency and severity, not something to manage on your own with over-the-counter anything.
The Practical Takeaway
One short seizure in an otherwise healthy dog is frightening but usually not an immediate emergency — call your vet that day and get it checked out. A seizure lasting more than 5 minutes, back-to-back seizures, or a first seizure in a senior dog is when you stop waiting and go in. Either way, the single most useful thing you can do in the moment is time it and stay calm — your dog is taking cues from you once they come out of it, even if they don’t fully recognize you yet.