The main thing you need to do when your dog is having a seizure is to remain calm. Dogs can sense your nervousness and it will reflect badly in their time of discomfort. Get close to the dog and make sure to exude a calm, confident energy. This will calm the dog and help it through the seizure. During the seizure, the dog may not be in complete control of his body, and it is important to stay away from his mouth in case he bites down. It is not due to a conscious effort on the dog’s part, but it can still happen.
Make sure the dog is getting a lot of air circulation. It is important that the dog gets the proper amount of air to the brain during a seizure. If the dog has a seizure in an area with very poor circulation, carefully move the dog as little as you can to get them out into more open air. Also make sure the dog is kept warm during the seizure. This will help the blood flow and make it easier to get through it. If you can, keep a towel or blanket of sufficient size to cover the dog nearby.
Keep the animal safe. During grand mal seizures, it is possible for the dog to inflict some kind of injury onto itself. If he is moving around a lot during the seizure, move small objects he might come in contact with away from the area. It is important to keep a record of the dog’s seizures, when they started and how long they last. This way if the problem becomes bad enough to see a vet about, you will have something concrete to show, this will help the vet get an idea of what he is dealing with.