Why is my dog suddenly barking so much?

I have a 3 year old dog. We have had her since she has been six weeks old but she barks all the time even at the people that she knows and nothing that we do can stop her she gets herself in to such a state with her hackels up growling and everything but she runs away whilst doing this is there anything we can do about it ???

it may be a ghost or just that he/she fill something is wrong. so just watch how he barks and you will figure it out!!!!

your dog might be board and wants attention. or maybe is having problems wiht sight or hearing. maybe just a good dog traing class would help