[Vent] Having to PTS my dog for behavioral issues

First time post after many years lurking. I've had my border collie/ Dutch shepherd mix pup since she was 6 months old. She came from a supposedly rough situation where she was unsocialized and physically harmed. She was young, but impressionable. When I took ownership of her I knew she had behavioral issues but as a person (23F) who's worked her entire life with animals and based my college and career of it, I felt a home with me would be her best bet at a normal life. She turned 4 in early April and has been a complete godsend to me. She is extremely intelligent, trainable, and beyond sweet. Only caveat is her fear aggression. She has had tendencies to herd people in the house for the entire time I've had her and had trouble warming up to people. Overall, she has unfortunately nipped at numerous people... whether they have come towards her too quickly trying to pet her, or just walking by swiftly and stressing her out. I know by her reactions and actions that she has remorse when she goes after someone or on rare occasions hurt them; but there is a clear switch that goes off in her when she feels threatened or her home or mom(me) is not safe. She not too long ago got out when my dad went to meet a neighbor of ours in our driveway and went right for her leg. I only heard of it as I was driving a long distance home and thought the worst (she has a bite on record from an incident that related to someone trying to feed her and she was startled by another person walking in the door of our kitchen). Fortunately our neighbor was understanding and was very kind about the incident, but that was the last straw. After speaking with several behaviorists and the vets I work for at a large practice, they determined that she has a neurological issue. Due to many reasons relating to her behavior in general. Seeing as she's always been this way, I never really thought about how bad it's gotten or how none of the training or socialization is helping. Medications aren't an option for her and trainers can't guarantee she won't bite someone again or won't deal with her since she has bitten already. She is my absolute world and I am devastated that after many years of work, discussions with other professionals, the general consensus is that she needs to be out to sleep for safety of others and her own health. She works herself up to an unhealthy level around strangers in our home and has such trouble with the aftermath of any incident. So nervous and confused, she looks miserable. My family and I sat down with one of the docs I work with and discussed everything. Ultimately coming to the conclusion that this is the best decision for all parties. I cannot describe the pain and defeat I feel.I'm going to lose my little girl to faulty wiring and a bad puppyhood and theirs no more I can do for her. As a veterinary professional I feel like I failed her. via /r/dogs http://ift.tt/2sdUS1C