:Honestly, I feel cases of dogs who are legendary or a monument based on a poem don't deserve to be under the heading Similar Cases but could be put in SEE ALSO.  It makes the story of Hachikō less special and less believable to lump him in with Argos and the Tuckerbox Dog.  Why not stick in Gelert while we're at it?  All that is listed on the List of Faithful Dogs page called List of individual dogs#Faithful after master’s death.