Seizures in Chihuahuas: What to Do, Causes and When It's an Emergency

Watching your Chihuahua have a seizure is one of the worst experiences a dog owner can have: the dog falls over, goes rigid, paddles the legs, drools, and for a minute that feels like an hour doesn’t respond to anything. Then they get up dazed, as if they don’t recognize you. And you have no idea whether something terrible just happened, or whether it’s about to happen again.

This article is meant to be read before it happens, and kept handy if it’s happening now. First the urgent part: what to do and when to rush to the vet. Then the causes, which in a Chihuahua have their own order, and the treatment.

This article is for information only and is not a substitute for advice from your veterinarian. Any seizure, however short, deserves a vet visit.

What to do while your Chihuahua is seizing

The American Kennel Club summarizes the steps vets recommend, and they’re the same for a Chihuahua as for any dog:

1. Move anything that could hurt them: furniture, sharp objects, whatever’s within reach.
2. Keep them away from stairs, beds or high sofas. If they’re up high, lower them to the floor carefully, holding the body.
3. Keep other pets away; they can react badly.
4. Note the time. Count from the moment consciousness is lost until normal awareness returns. Duration is the single most important piece of information you’ll give your vet.
5. Record it if you can do so without neglecting the dog. A 30-second video is worth more than any description.
6. Don’t touch the mouth. They can bite without meaning to, and there’s no danger of a dog swallowing its tongue.
7. Don’t shake them, shout, or throw water on them to “snap them out of it.” All that does is prolong the seizure.
8. When it ends, leave them somewhere quiet and dim, and speak softly. They may be confused, clumsy, even temporarily blind or aggressive for minutes to hours. That’s the postictal phase and it’s normal.
9. Write down how long it lasted, what you saw, where it started, and what happened beforehand (ate something, was asleep, got excited).

For a Chihuahua there’s one extra step: if it’s a puppy or a very small dog that hasn’t eaten in hours, as soon as they regain consciousness and can swallow, rub a little honey on the gums and head to the vet. Hypoglycemia is the number one cause of seizures in puppies of this breed, and honey buys time. Details are in hypoglycemia in Chihuahua puppies.

When is it an emergency?

The AKC is clear about the thresholds. Go to the emergency vet now if:

• The seizure lasts more than five minutes. That can be status epilepticus, a life-threatening emergency.
• There’s more than one seizure in 24 hours (cluster seizures).
• The dog doesn’t recover normally between one seizure and the next.
• It’s a puppy, or you suspect they ate something toxic.

The danger in status epilepticus is body temperature: with that much muscle activity, a dog can pass 105°F (40.5°C), which damages the brain and organs. If you’re on your way to the clinic with a dog that won’t stop, lay cool, wet towels on the belly, groin and armpits.

A single seizure under a minute with normal recovery isn’t an emergency, but it is a vet visit: book an appointment in the next few days and bring the video.

Seizure or shaking: the classic Chihuahua question

Because Chihuahuas shake at everything, many owners confuse the two. The difference is consciousness:

Why Chihuahuas shake, and when shaking does warrant a vet visit, is in why do Chihuahuas shake. And there’s a third look-alike: fainting (syncope), typical of dogs with heart disease, where the dog collapses but recovers within seconds and looks normal right away. That one leads to heart murmur and mitral valve disease.

Focal seizures also exist: the dog stays conscious, but the face twitches, the jaw moves as if chewing, or a movement repeats. They’re seizures all the same and deserve the same vet visit.

Why do Chihuahuas have seizures?

As the AKC’s chief veterinarian puts it, “a seizure is a sign, not a disease.” In a Chihuahua, the causes to rule out change with age:

In puppies (under one year):

• Hypoglycemia. Always the first suspect, especially in puppies under three months and the smallest ones.
• Hydrocephalus. Fluid buildup in the skull; more common in dome-headed toy breeds. What it is and how it differs from a normal molera is in the Chihuahua molera.
• Portosystemic (liver) shunt: a malformation that lets toxins bypass the liver into the blood.
• Infections like distemper, in unvaccinated puppies.

In young adults (1 to 6 years):

• Idiopathic epilepsy. The most common cause of seizures in dogs, affecting 2% to 5% of them. It’s diagnosed when everything else comes back normal.

In seniors:

• Brain tumors, advanced kidney or liver disease, and age-related seizure disorders, which often respond well to medication.

At any age:

• Toxins: chocolate, xylitol (the sweetener in sugar-free gum), insecticides, wrongly dosed flea products, human medications. If you suspect chocolate, the chocolate toxicity calculator tells you what range they’re in.
• Head trauma, which in a 5-pound dog can come from a fall off the couch.

How is it diagnosed?

With your video, your description and a physical exam first. Then bloodwork to look for low blood sugar and liver or kidney problems, and sometimes a bile acid test if the liver is suspected. If everything comes back normal and the dog is a young adult, the likely diagnosis is epilepsy. In unclear cases, or in older dogs, your vet may recommend an MRI to rule out tumors or malformations.

What’s the treatment?

It depends on the cause. If it’s hypoglycemia, blood sugar gets corrected and the feeding schedule changes. If it’s a toxin, the poisoning is treated. If it’s a tumor, surgery is sometimes an option.

If it’s epilepsy, treatment means anticonvulsants for life: phenobarbital (the most used, inexpensive and well tolerated), potassium bromide, levetiracetam (Keppra) or zonisamide, alone or combined. Three things worth knowing:

1. They don’t cure it: they raise the seizure threshold so episodes are less frequent and shorter. The usual goal is one seizure every six months or fewer.
2. You can’t skip a dose. Some are given three times a day; one missed dose can trigger an episode.
3. They need periodic bloodwork, because they can affect the liver.

For long or cluster seizures, your vet may send you home with rescue diazepam (rectal or nasal) and precise instructions. It’s the first-aid kit of every epileptic dog’s owner.

At home, what helps most is routine: medication at the same time, regular meals, good sleep, and a log of every episode. Some owners identify triggers (lights, loud noises, stress) and avoid them.

A note on cost and insurance

Epilepsy is a lifelong expense: medication, bloodwork a couple of times a year, and the occasional emergency visit, which in the US can easily run several hundred dollars before any test. It’s one of the conditions where pet insurance pays for itself, provided the policy was in place before the first seizure, since anything already in the record is excluded as pre-existing.

What to remember

• During the seizure: protect, don’t touch the mouth, note the time, record.
• Over five minutes, more than one a day, or no recovery in between: emergency.
• In a Chihuahua puppy, think hypoglycemia first: honey on the gums and to the vet.
• Every seizure, however short, deserves a vet visit with the video.
• Epilepsy is manageable; many epileptic dogs live long, normal lives.

The rest of the conditions worth knowing in the breed are in common Chihuahua health problems.

Romeo and Lorenzo have never had a seizure, and I hope it stays that way. But since Lorenzo came home at a few months old, the honey jar has lived in the kitchen, within reach. Not for any particular reason: because in a 5-pound Chihuahua blood sugar drops fast, and because, as with almost everything in this breed, it’s better to know what to do before you need to.