I'm really glad to hear that things are on the upswing. My guess is that since you reached out and have been having these conversations, maybe you have a better sense of being on the right track, so have relaxed a little? Dogs, especially herding breeds, can be way more sensitive to the littlest body language than we realize. Especially those that have come from a home where they were treated harshly. My old McNab, whom I got when he was a year old, had very similar reactions as yours does, terrified of the hose, hated his collar or neck grabbed, would not pee or poop on the leash (basically "within grabbing distance" ) He would go as far away in the yard as he could get from me before he'd go. Eventually, he got over that, but all it took from me was a heavy sigh, and he would shut down. He was a great dog, so eager to please and easy to train, we did agility, rally, nosework and tricks, but I always had to keep it light and happy. Please be aware that the bite issue will not resolve itself, I still think you should try to get help from a qualified professional. Do keep us posted, we're rooting for you.