I am looking to do take the sleeper to Scotland with my one year old whippet. London to Fort William is just over 12 hours overnight. As is typical for whippets, he spends the majority of the time asleep, and is fine with shorter journeys by train, which is why I think this might be a good idea. However, I'm a bit concerned that there's nowhere for him to wee (he usually manages 10 hours overnight without going). I'm just wondering if anyone has experience of travelling by train with a dog for such a long trip, and if they have any advice. Thank you!