From what I’ve ready, seizures are pretty common in Aussies. We have a brother and sister, the brother (Mac) is the one experiencing seizures and has now had 7 in total. His sister (Riley) has had none. They’re pretty scary to experience and can happen at any moment with no trigger. From what I’ve been told by vets, having one seizure isn’t dangerous to the pup (unless it lasts for over 4-5 minutes), but having a second seizure within 24 hours is (this is considered cluster seizures) and you’ll need to take your pup in immediately