Damp is absolutely correct... and it's never a good idea to assume what's allowable, or legal in one country/city/county is legal in another. While ignorance is bliss in some circumstances, it's not when travelling with a Rottweiler.
It's always best to check the local ordinances, so one can be prepared, educated, and at ease that there will be no "trip interruptions".
That FCI link that Brutus posted is a terrific starting place to find national/local clubs, and is a great starting place to research local laws.
Good luck! Let us know what you find!