What to do if your dog has a seizure. If a dog has a seizure, it can be alarming, but staying calm and taking the right steps can help you and your pet: 1. Stay Calm: Dogs sense your emotions, so staying calm will help keep them from getting more stressed. 2. Time the Seizure: If possible, note how long the seizure lasts. Most seizures only last a few seconds to a couple of minutes. Seizures longer than five minutes or multiple seizures in a short period are emergencies, and you should call your