I've trained German shepherds from a very young age with my family , Ive also owned two German shepherds, two pitbulls and a weimaraner and 3 cats and have lived on a farm with goats and chickens so I'm very good with animals. I also use to volunteer at the SugarHill Animal Hospital simply because I loved helping families nurse their pets back to health. I also saved my two pitbulls off the kill list. I dont believe any dog is born aggressive. I've also had to help many dogs that has had past abuse become use to being loved on and use to other dogs and strangers. All of my dogs are free leashed when walking because they never leave my side because of training while walking which I wouldn't mind training your dog while they are at my home or while I'm at yours. You can always teach a old dog new tricks.:)