
I would also recommend the ferry route, my dogs all come to me via ferry as I live on the Isle of Man & for every show we must travel by ferry & we've never had a problem. They are always calm & happy on the ferry and when ever I have a puppy I always ask a member of staff would it be possible to check on them and they are more than happy to come & coo over a puppy ha ha.
I have on many occasions flew to Ireland for shows when there aren't any ferries and they seem to get very hot and bothered when flying.
Hope this helps :)