My toy poodle was compelety pottied trained, going to the door on her own by the time she was 3.5 months old. I didnt get her untill she was 10 weeks. Tucker wasnt competley trained untill he was 7 months old and still sometimes wont go to the door on his own (he paces when he has to to go). She is very smart!!
... your friend choose a great breed.