About a week ago, on the train back from my university, a small dog (a JRT cross, I think) got on the train roughly fifteen minutes before the end of the line, where I get off. It was, of course, freezing cold; the temp was hovering at about 0C. The little, long-legged dog had a padded coat on, and crawled onto her owner's lap as soon as he sat down.
She spent the entire journey wide-eyed, repeatedly licking her lips, panting and shivering. She showed the clearest stress signals I have ever seen in a dog, and I hope I never see anything that bad again. Poor girl.