Yes, it is usually possible to take the dog on board the boat to Norway. On the longer crossings, kennels can often be booked or the dog is allowed in the cabin. On short crossings, the four-legged friend can remain in the car. There are some formalities. For example, the dog must have an animal passport, a microchip, timely rabies vaccination, and treatment against tapeworm. If this is not followed, there is a risk that the dog, cat, or ferret will have to be quarantined for four weeks. More info regarding bringing pets on ferries.