man's best friend [manz-best-frend]
1. a tame dog.
EX. "The one absolutely unselfish friend that a man can have in this selfish world, the one that never deserts him and the one that never proves ungrateful or treacherous is his dog."-George Graham Vest, 1870
The previous quotation is considered to be the origins of the phrase, man's best friend, but I think we all know the idea of canine loyalty goes back about as long as man has domesticated dog (or as long as they've humanized us). Sad dog stories and inspiring dog stories are as much a part of our collective mythos and history as war. From Futurama's Seymour in Jurassic Bark episode to Disney's Old Yeller (1957) to the oldest sad old dog story I can think of is Homer's story of Argos in The Odyssey.
Argos was Odysseus's dog and waited for his master's return for 20 years. Once known for his strength and speed, upon his master's return, Argos had grown old and neglected. Odysseus returned to his home disguised as a beggar and the old hound recognized him but only had the strength to lift his ears and wag his tail. Odysseus shed a dear for his dear companion before going inside his home. Argos then dies.
If Superman is a role model for what a man can do with unlimited power, then Krypto is a role model for what a man can do with unconditional love. Today's subject is Krypto, Superman's best and most loyal friend.
But just as his master, Krypto is too important as a symbol of canine loyalty to be thrown aside forever. He has been reborn as many times as Superman. above you can see his most redesign in the New 52 reboot. He has become more alien, they mixing features of wolves, cats and dogs to create a more powerful looking animal. Krypto will continue to evolve alongside his master, as dogs have evolved for thousands of years.