Bark collars do help. My female was a fence barker at my inlaws. She would get going and nothing could pull her out of that mode. She's not a big barker so it was a shock when she started that immediately. We originally bought the collar for my previous male because he would bark and carry on despite being told 'quiet' and knowing the command. It worked very well.
The collar I have is reset when the battery gets changed but it basically changes the setting each time the dog pushes their luck. It's been effective to prevent unnecessary barking. She learned very quickly that when the collar is on, she is expected to be quiet. Downside with bark collars is the dog knows when they're on and will adjust themselves accordingly. If you accidentally forget to put it on when you should, the dog knows that and often times will take full advantage of it.
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