We've been criticised for "judging" and yet the OP and her friend, neither of whom are experts or behaviouralists, have judged that this poor dog will hurt a child and they have judged that he is to be killed although he has done nothing wrong.
More inconsistancies abound, this is bloody ridiculous. Despite the fact that Rob told me that the owner has decided to kill her dog, despite the fact that Purple isn't denying it but is attempting to justify it, she is still maintaining that the dog whom the owner intends to kill is going in for a routine cyst op tomorrow. 
So which is it? Is the dog going to be killed tomorrow or operated on?
No... don't bother replying because the answer is right up there at the top on your title thread isn't it Purple? Your very first post states,
"He's due in for an operation on Thursday, and the official story will be that he doesn't survive the anaesthetic"
Your friend had decided this poor dog's fate before you even wrote your OP.
She'd decided to kill her dog based on something he hasn't done and neither you nor she are qualified to judge that he ever will. She's even got the excuse ready to tell the kids... all you both wanted from us lot, parents and rescuers on here, was validation, not suggestions of help because you aren't interested in that. You and your friend wanted people to tell you there, there, you've done all you can, the dog is beyond help, it's okay to kill him.
Well fuck off, both of you, because it's not and never will be okay to kill a healthy animal.
Judging? Too bloody right I'll judge someone who is intent on killing a healthy animal, much less then lies, deceives and expects me to validate their heartless cruelty.