Putting a collar and ID tag on your dog is a good idea just incase he gets spooked. Please make sure you have a recent photo of your dog along with up to date details on his ID tag and microchip.
Knowing that your pet may become stressed can leave you feeling stressed too but it is very important that you try and stay calm as dogs pick up changes in your behaviour.
In the coming weeks before the firework season, you could buy a CD with firework sounds or find the sound of fireworks on the internet. Gradually increase the volume and praise any calm beaviour shown. This may eventually get your dog used to the noise that they find scary.
Create a safe den for your dog. A good example would be a crate with a blanket over the top and inside. Do not forget to add his faviourte toy. You can also create safe places for your cat if he finds fireworks scary too.
It is fine to comfort your dog if he is feeling scared as it may help him to relax. If you think it isn't helping them stop immediately.
Ask your local vet about pheromone diffusers which may help to calm your pet.
I wish you all a fantastic and safe bonfire night!