I just realized this character sheet isn't on here! This is Blrgl, he is a cuttlefish x mini bull terrier hybrid with a little bit of shark thrown in. We call him a cuttledog.
He changes colors, the purple is the only part that stays consistent throughout all of his color changes but the yellow markings are the main part of the character sheet are the "default" colors/markings I draw him in.
Link
Iron Eater
What a little cutie! I really like the body shape on him, plus the color-changing effect.