Ummm, I don't think I would ring the news people. I can see that this is truly horrible for your SIL and brother, rickman, but the wider public are not really going to opt for disrution of timetables (turning the power off, getting someone along the track etc is bound to disrupt several services, with knock-on effects) and expense when the poor dog is not a danger. So I can't see a newsdesk editor going for it.
rickman, can you think of any other way to distract your poor sil - take her out to buy some flowers or bulbs to plant as a memorial, or something?