I am currently fostering a beautiful 2 year old border collie. She has the sweetest character I've ever known in a dog and I've had dogs all my life, including other BCs. However, she has a lot of issues. Some typical BC quirks, which is fine but her main issues are extreme aggression towards people and dogs. I am part of the brigade of people who walk at silly-o-clock in the morning and night but we still run into the odd person, cyclist etc where we are (busy place, always someone going to/from work etc). She goes into a white foam frenzy. I have her on 3 leads just incase one snaps, including a halti, as she is as strong as an ox. I do all the advised things with her - clicker training, sniff work etc. We have tried to find another home for her and can't (no dogs or animals of any other kind, no children, no normal dog walking etc). None of the breed-specialist rescues will take her. Can't go in kennels. Can't go in doggy day care. Goes into a frenzy when off lead in a secure field (just mindlessly runs, gets hysterical and can't calm down, plus she is distressed in the car on the journey). She is constantly vigilant in the house, despite my best efforts with calm time etc. Her life before me was shit (people should have been tortured prosecuted) and so, versus that, she lives like royalty but her quality of life is still hugely compromised and she is living a half life. So my question is, do you think she is a pts case?