It is antisocial these days it appears, to own a dog. The only time I came across an aggressive dog when having my dog on a lead was an alsation. I dropped my dogs lead immediately to give her a fighting chance & bless her, she ran away, stopped, picked up her lead & carried it herself. Seriously though, dogs need to be able to socialise with other dogs so that they grow up to be non aggressive. If you really think about it, most of the dogs that you hear about that injure children do appear to be owned by relatives.