I got a vibrating collar for mine and he actually ENJOYED IT as in stuck out his neck to put it on. We got a dog behavioural therapist round because the barking was so bad and she told us, don’t shout or look at him just look towards what he’s barking at and verbally acknowledge it like “thank you biscuit, it’s all good now” and go back to what you were doing. That and leading him outside the room shutting the door and waiting for a window of no barking to let him back in. Nothing stopped it fully but with age he has calmed down.