NC for this - this is long, sorry
I am really upset and a bit in shock. I adopted a dachshund over a year ago who had been in an awful state and very unwell. She had lots of visits to the vets the first couple of months.
From day 1 she was understandably VERY stressed and anxious. She got used to me and my DP quickly and became very attached. Anyone else she would bark lots at and not relax even if they had been in the house a long time. When she was like this she wouldn't pay attention to anything other than the person in the house, we would put her into other rooms so she had her own space which would result in her barking more and weeing and pooing everywhere. The vets gave her some tablets to try and calm her down as she was also losing fur from what they assumed was the anxiety
I did lots of research and had a dog trainer over (who said they specialised in aggression and anxiety in dogs with lots of good reviews) who told me she's had a stressful life and has separation anxiety and we mustn't encourage it so stop giving her cuddles etc as it will make her worse. Don't let people invade her space, let her go to them when she's ready, have a crate that she can go to get away and lots of other things. This didn't seem to help and she would go up to them barking still and then trying to lunge. She was also very stressed out on walks and would growl and bark at anyone walking past us even if they were far away.
The dog trainer told us that there wasn't much he could do to help other than what he's already suggested as she was too much in a heightened state so she wouldn't pay attention and it would be useless trying to get her to calm down when she wouldn't be able to once she's already at that level
We then had a dog behaviourist who we had many lessons with and not much changed, she would bark for the whole 2 hour sessions at the behaviourist and never get used to them enough to be able to be worked on, the behaviourist tried lots of desensitisation which didn't help. The whole time I still made sure she had her own space and wasn't invaded etc. We then had lockdown so no one in the house for a long time
Today my friend came over to drop something off and I told her stay where you are don't say hello to dog as she's nervous (she met her before so was aware of how dog was) my dog as soon as she came in the house lunged for her and bit her hand really hard (punctured) I grabbed her off quickly and she went for me and I took her upstairs and shut her in bedroom. I apologised lots and lots to friend
I feel absolutely awful this has happened and so guilty. I knew she was scared but didn't know it would get to this point of biting. I'm not sure what else I can do?? Does anyone have any experience or suggestions, I'm really upset by it all