Difference between poetry and prose?

[abu nuwas]

I see a lot of suggestions that metaphor, in particular, is a cue as to whether a thing is, or is not, poetry. Yet I use it in everyday speech. When I say ''That guy is a complete fruit-cake'' , about someone who sees things very slightly differently from me, I do not truly suppose him to be something fresh from the baker's. But nor do I imagine I am declaiming a mini-master-piece.

Pup is doing well.......