Seizures consist of three components:

1)  The pre-ictal phase (aura), is a period of altered behavior in which the dog may hide, appear nervous, or seek out the owner. It may be restless, nervous, whining, shaking, or salivating. This may last a few seconds to a few hours. This period precedes the seizure activity, as if the dog senses that something is about to occur.

2)  The ictal phase can last from a few seconds to several minutes, and can vary in appearance. The ictal phase can range from mild changes in mental awareness, such as a dazed look, mild shaking, staring aimlessly, licking lips, to a complete loss of consciousness and body function. If the dog experiences a grand mal, or full-blown seizure with loss of consciousness, all of the muscles of the body move spastically and erratically. The dog usually falls over on its side and paddles its legs while seeming to be otherwise paralyzed. The head will often be drawn backward. Urination, defecation, and salivation may occur. If the seizure has not stopped within five minutes, the dog is said to be in status epilepticus or prolonged seizure (see below).

3)  During the post-ictal phase or the period immediately after the end of the seizure, there is confusion, disorientation, salivation, pacing, restlessness, or even temporary blindness. There is no direct correlation between the severity of the seizure and the duration of the post-ictal phase.

Information reposted from: https://vcahospitals.com/know-your-pet/seizures-general-for-dogs