We put our 1.5 year old dog down because she was highly aggressive toward all strangers, all strange dogs and had a very short list of people she did like. She had to be carefully monitored during training sessions since she would often attempt to attack people when they turned their back to her. She had to be walked in the country where there was zero chance of running into anyone or she would go after them. She had to he muzzled and sedated at vet visits after attempting to attack vet techs multiple times. She couldn't go to any dog friendly stores or places because she was wildly unpredictable. We trained from 8 weeks old. We tried everything from special seminars, multiple trainers, behavioral therapist, vets, medications. She was simply dangerous. There were no other home options.