I was doing research and found this and thought it provided great information regarding seizures. The original website has great links
Dog Seizures Symptoms Dog Seizures Symptoms
Seizures are abnormal surge of electricity or nerve signal burst from the brain. It is one of the neurological problems that often found in most dogs.
The seizures symptoms such as drool, collapse, thrash and uncontrollable legs can be frightening and shocking but dog feel no pain at all. They will only show signs of confusion.
During seizures period dog do not swallow their tongue and don't try to put their tongue in their mouth because there is a high risk of being bitten badly. It is very important that every dog owner must keep their pet down on the floor to prevent them from further harms such as injuries, falling and hurting themself.
Be aware that dog body temperature will rise if the seizures continue to happen for longer that few minutes which can lead to the development of heat stroke (hyperthermia) causing the situation to be even more worst.
The 4 Stages of Dog Seizures Symptoms Prodome
There will be change in mood and behaviour and this period last from hours to days.
Aura
This is the initial signs that your dog will start to have seizures. This period may last for about few second to hours and the symptoms are as follow:
finding a hiding place
appear nervous
seek out the guardian
shaking
whining
trembling
salivation
affection
wandering
restlessness
apprehension
Ictal
Dogs will show sign of intense physical activity during this period and last for few seconds to five minutes. All of the body muscles will contract strongly and the apparent symptoms are:
lose consciousness
falling to the ground
paralyzed, reluctant to move or can't stand up
shaking -
excessive drooling
head drawn backward
teeth gnashing
frantic thrashing of limbs
vocalizing
paddling of feet
salivation
uncontrollable urination and defecation
Dog will be in prolonged seizure or status epilepticus (SE) if the seizures is not over within five minutes.
Post Ictal
After the seizure ended your dog will have the following symptoms:
confusion - both seemed a little dazed and confused for a short while
disorientation
temporary appear to be blind or deaf
eat or drink excessively
pacing
salivation
restlessness
Status Epilepticus (SE)
A very dangerous and life threatening situation that occur when a seizure last for more than five minutes. This can damage the brain if the period last for more than 20 minutes due to no rest or muscle relaxation inside the brain.
Emergency treatments and injectable medications must be given by your veterinarian if seizure continue to last for more than five minutes and your dog doesnot recover to full consciousness.
Causes of Dog Seizures
brain tumor
head injury
cancer
diabetes
tick bites
heart block
excessive daytime sleepiness (narcolepsy)
insufficient production of thyroid hormone by the thyroid gland (hypothyroidism)
overactive tissue within the thyroid gland (hyperthyroidism)
disability involving damage to the joints (arthritis)
acute inflammation of the brain (encephalitis)
chronic neurological disorder (epilepsy)
low level of glucose (sugar) in the blood (hypoglycemia)
low serum calcium levels in the blood (hypocalcemia)
a qualitative or quantitative deficiency of hemoglobin, a molecule found inside red blood cells (anemia)
shortage of oxygen in the body (hypoxia)
deficiency in the concentration of dissolved oxygen in arterial blood (hypoxemia)
elevated blood level of the electrolyte potassium (hyperkalemia)
abnormal raise of lipids and/or lipoproteins level in the blood (hyperlipoproteinemia)
rocky mountain spotted fever
viral disease (distemper)
lyme disease or borreliosis
liver disease or hepatic encephalopathy
renal failure or kidney disease
gastrointestinal disease or garbage poisoning
parasitic disease caused by the protozoan Toxoplasma gondii (toxoplasmosis)