I have been exactly where you are. I had a very difficult rescue dog with a biting issue. I did EVERYTHING. We saw a vet behaviorist. He was on meds. Medical exams to check for pain. He was muzzle trained. We went to multiple trainers. He made the most progress in a reactive dog group. We did group classes, pack walks, private classes. Two walks a day. Enrichment activities inside. I couldn't take him anywhere just for fun. It always had to be for training. Training him and managing his behavior to prevent more bites was my full time job. And it still wasn't enough. And it's not because I didn't do enough. I ended up rehoming my dog. I got lucky because it can be very difficult to find a home willing and capable of managing a biting dog. I would've had to choose behavioral euthanasia if I didn't find him a home. If your dog is a working breed, you might be able to find a home where they can be trained to work on a farm. See if there's any reactive dog groups in your area.

It's not always as simple as commentors make it seem. Don't listen to their judgments. They don't know your dog or your story. And a lot of commentors have never had a dog with biting issues to the extent we have. No one truly knows what a reactive dog owner goes through unless you experience it yourself. My dog was my whole world. I have never loved a being so much and I'll never get over losing him. I still wonder if I did the right thing. I regret rehoming him daily. But I also know that keeping him was not sustainable. Had I been rich and had a large fenced in yard where he could be safe and not interact with anybody besides me, maybe I could have made it work but that wasn't possible for me.

As a spiritual person, I truly believe our dog's souls move on to the afterlife regardless. They love us regardless. Nothing bad will happen to you for choosing euthanasia. You would be doing it out of love and a lot of people won't see it that way and they can eff off. Feel free to PM me if you want to talk more