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Seizures are common in dogs, but more unusual in cats.  Seizures are just symptoms which can occur with many kinds of diseases.  They can happen because of diseases outside the brain or inside the brain.  Low blood sugar that can happen with an overdose of insulin or with a tumor of the pancreas can cause seizures.  They can happen with diseases of the liver or kidneys.  Ingestion of toxins such as snail bait can cause seizures.  Lesions of the brain such as tumors, abscesses, granulomas, infections, or inflammatory diseases can cause seizures.  Epilepsy may cause seizures.

Seizures most commonly last for a few seconds to a couple minutes.  Grand mal seizures cause the head to go back and the legs stiffen with rhythmic jerking.  The pet is usually unconscious.  Smaller partial seizures may be more difficult to recognize, but you should be suspicious of any repetitive rhythmic movements.  After the seizure, the pet usually enters the post-ictal phase where it is dazed, lethargic, and not able to walk normally.  This phase may last for minutes, hours, or days.  A pet may have one seizure, and never have another, but most commonly they do recur.

Testing should be done to try to determine the cause of the seizures.  Blood testing, urinalysis, and liver function tests are commonly done.  An MRI of the brain or a spinal tap is much less commonly performed but may also be needed.

Intravenous medication can be given by a veterinarian to stop a seizure.  If the seizures become too frequent, usually any more than every four to six weeks, anti- convulsant medication can be given to try to reduce future seizures.  Anti- convulsant medicine does not guarantee a pet will never have another seizure, but it tends to make the seizures shorter in duration and less frequent. Phenobarbitol is the most common anti-convulsant medicine prescribed.  When a dog first starts on this medicine, it will act like it is drunk for the first week or so, until it becomes accustomed to the drug.  Phenobarbitol may be given twice daily, and once it is started, it is usually given for the life of the pet.

Potassium bromide is another common anti-convulsant prescribed.   It is available only at special compounding pharmacies.  It is usually formulated into a liquid.  It is typically administered to the patient by mouth once daily. There are pros and cons to both treatment options which can be discussed with you by your veterinarian once the decision to treat the seizures has been made.

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