i also agree with this, as a huge cat lover i'm all for more cats and more interaction with them here! I'd like to know just how many cats are on each route too, i wish there was a list or something of where they all are.
I know not historically accurate but I would still like to see Felix (RIP) and Bolt at Huddersfield on NTP. And if DTG ever make the Snow Hill network around Birmingham then George at Stourbridge Junction (check out his FB page) is a must - he is a complete nutter!
You could also have a small number of passengers travelling with dogs on a lead. Good one for conductor mode, "Get that mutt off the seat."
I don't know about UK regs, but over here, only service dogs are allowed on trains and owners don't want you to pet them.