Yes – greyhounds are trained to behave in a way that benefits both the owner and the trainer.  They have to behave at the track and around other dogs.  However none of that training is relevant once they become family pets.   Greyhounds have spent their life locked away in a very institutionalised way and know very little of real life as a family pet.  Most adapt very quickly, some don’t for various reasons and training helps them settle into regular life enormously.    Greyhounds are different to every other breed of dog.  They have never known a home life before, they may not have seen other types of dog and they may never have been in a home.  In other words they may have no idea how to behave as a pet dog.  Lurchers will have experienced some degree of normality but may still only ever have lived in outdoor kennels.    When a dog knows what is expected of him – he is a much happier dog.