aggressive english shepard
my dog is an english shepard he turns 1 year on january the 31st. i take him on walks every now and then he is super friendly towrads other dogs and is very playful. but when it comes to meeting strangers he is not as nice. some people he just ignores and pays no attention but if aproached he will attack and other people he just sees from a distance and lunges and barks even his back hairs go up and he attempts to attack them. recently i took him to this place that is fenced in and an old man was walking and my dogs ran into the fence he started running and barking and as usally his hairs were up he would not stop trying to find a way to get out i was so scared because there were some gaps between the fences and i thought he was going to get out and bite the man i was call him and he would just ignore me . my neigbors come out and he just tries to btie them. no one that he does not know can try to pet him because he will try to bit them.and he cant go offleash or he will runaway and not come back this scares me because he will be running away from me and if he encoutners apearson he could bite them and i do not want that to heppen . please help?? i dont know what to do !