Posted : 8/22/2011 9:12:26 AM
Dyan, it is very common for dogs to stop breathing, esp. if it is a grand mal seizure. That is why cluster seizures (one occuring right after the next) are so dangerous - a dog stops breathing with no chance to recoup can end up with serious brain damage.
I agree with Jackie, if she can get a video, that will help the vet see what is happening, although I am fairly certain the vet will caution her about this regardless.
ETA: the heavy panting occurs most often pre-seizure and post seizure, not always during, but it may differ for each dog.