Gold Single, a compact sleeper cabin featuring a bed that converts to a seat by day and shared shower / toilet facilities at the end of the carriage. (vjv.com)
If you travel first class, or solo in a standard sleeper cabin, you can take your dog. (tripsavvy.com)
From here you will board the Riviera Sleeper, a rail service that runs through the night to Penzance, staying in sleeper cabins for the duration of the journey. (raildiscoveries.com)