We adopted our blind American Staffordshire Terrier, who we think is about 7 years old. She comes from a fighting background. We've had a wonderful relationship with her, and she has loved everyone she's met, but every time she meets another dog, she goes into fighting mode. Then she attacked our daughter when she came to visit, tearing her pants and scratching her leg with her teeth while she was in the driveway. We have never seen this behavior before. We are not unsure about her and don't know what to do. We don't want to give up on her.