If articles have referred to the dog as Dog, then that's surely enough. You say "Dog" isn't a name when there've been several movies where the protagonist or a character has a dog called Dog. Big Jake and Mad Max 2 had dogs simply called "Dog". If you have a major issue with it take it to the talk page instead of causing an edit war as the page will simply be protected and stop any editing.
Oh and removing one's message when they're going out of their way to y'know try and mediate this to prevent an edit war is just childish and being a dick, grow up. What made this message unnecessary? Are you saying you'd rather an edit war happen an admin get involved?