The rumor's zippin' all over Zion . . . it's Neo-romance for "Matrix" hunk Keanu Reeves and a mystery blonde New York fashionista! Word is they met cute at Doggie-Do, the swanky Madhattan pet groomery where Keanu has his pooch pampered! Don't know how well he's treating the blonde, but his dog gets thrown more than a bone! Says an insider: "Keanu buys his dog really extravagant toys and goodies!" Bow-WOW!