One of my cats suffered from epilepsy. This is one of her many attacks. A cat experiencing a grand mal seizure usually falls on her side and has uncontrollable muscle activity such as kicking her legs as if swimming or paddling. Salivation is profuse and often the cat involuntarily urinates. In the end I had to put her asleep.....sadly...( July 9th 2010 ). I still miss her....