Good on ya for considering rescue!
Have a read through this thread, there are many links given, lots of good advice as to the process.
Adopting a pet from a Rescue Centre
One thought - Switzerland is very small - don't let geography limit your search.
All the best to you and your future four-footed friend.
ETA: Just in case you haven't come across this yet - are you a first time dog owner? If so, you will need to take the SKN theory before adopting - be prepared to bring proof when you visit the rescue. (If not a first time owner then this does not apply, but you will be required to complete the SKN practical course within 12 months of adopting your dog.)