Floppy ears are just pointed ears that failed to rise - perhaps because they became too big. A German Shepherd pup has floppy ears and they eventually start to stick up, after going through a phase where they can't decide.

There is something impressive that a Chihuahua can instantly somehow recognise the Great Dane or Pekingese as of type dog, even at great distance upwind. Yet can react differently to cat, sheep, fox or squirrel at similar range.