RE: A dog was killed trying to save his owner from a train
The third story is quite famous and the dog was known as Greyfriars Bobby. The story is that after the owner died the dog used to lay on the grave each day and was looked after by the local people. However it came to light more recently that the original Bobby had died and by that time the locals were cashing in on the story because Bobby had visitors who used to stay in the local Inn. When the original Bobby died they found a replacement for him to keep the story going and the funds in their pockets!
The most tragic dog story of this kind has to be the tale of Gelert. The story goes that the master left his son with the hound whilst he was out hunting and when he returned he found the baby had been killed. He saw blood on the hounds mouth and drew his sword and killed the dog as he thought it had murdered the baby. He then found the body of a wolf next to the babies crib and it become obvious that the hound had been protecting the baby. The dog owner was so upset by what he had done that he buried the dog is a special grave and in fact the village was then later named after the faithful hound.