Here is a few things that I have learnt that have made my life much easier with travelling with dogs.
Paperwork. Before you leave send all important documents to the cloud. Or as I did an email address. This way if anything goes missing you can retrieve all information.
For dogs bring folding bowls for food and water. This makes it much easier to move and carry.
Pack both harness and collars with you everywhere you go. You never know when you will need them. There have been times I have gone to town and needed a harness and not had one.
First aid kit. Before you leave, go to your local vet and ask them to explain some basics to you like if your dog cuts their foot, hoe to clean and bandage it. Bring that stuff with you. Also look at what medications are poisonous for your breed.
Bring muzzles regardless of whether your dogs are big, small, aggressive or not. Some public places my require them to have muzzles.
Bring their passports with you everywhere.
I think that’s all for now.