Hello, i have an aggressive dog who is about 2 years old. He barks a lot when people he doesnt know drive into the yard. i have even been told he has bit someone but just grazed and not punctured. i am afraid that he will not be so lucky and will bite someone, and make it a serious emergency. i would never take him back to the animal shelter and am considering him staying with a family member who has less company, and wouldnt be in an aggressive situation like this. any suggestions or tips to break him of this are greatly appreciated. thank you.