This is a questionable technique for me as it is definitely painful to the dog
and if you get angry it may be easy to pinch too long.
Citronella Dog Collar
The citronella-spray collar works on the principle that a mild unpleasant smell can stop barking.
Choke Collars
Choke collars work on this same interruption idea but with no link back to being a puppy. The pinch collar interrupts the unwanted behavior.. The trouble is we humans can't hear ultrasonic sound so it's hard to make a call on whether this is too loud or even painful for a dog.. To be effective any measure has to be consistent and removing the collar is not consistent. This effectively stops the dog in mid bark most times. And never never never use it as a punishment.
Humans can't hear this but dogs can as it's an annoying, high-pitched sound that is triggered whenever the dog barks. Citronella is a natural oil with a lemony smell that is quite pleasant for us but unpleasant for dogs (but not inhumane). A popular one is "Bark Free" although they all work on the same principle most have a range of between 20-70 feet. Dogs eventually figure Ultrasonic Handheld spot Welder it out.
Pinch Collars
So you are at the end of your tether..
If you decide to do this, get properly trained in its use and how to put it on your dog. However, they all work on the idea that a loud noise that will startle a dog and cut off the barking.. I would hesitate before using these. Some models you can adjust the voltage. These collars imitate what their mothers used to do to correct them as puppies.
For dogs that don't belong to you, there are devices that generate an ultrasonic noise if there is a dog barking in range. You have what looks to be an un-trainable dog. A more serious measure that has been around for a long time is the pinch-collar. They are mounted outside as close as possible and ideally in line of sight of the barking dog. They will stop barking eventually but don't get to the cause of the barking and the shock is unlikely to be understood by the dog. Big drawback is that you need the lead to be on and you to be right with the dog. And follow-up with praise and a pet.although some revert to barking when it is taken off. Some trainers think these cause more aggressive behavior as the dog gets frustrated angry and scared.a tad unfair and confusing methinks. You have to hope the dog stops barking or you'll have 2 noise sources.
Sonic collars operate on the same principle as ultrasonics, but this sound can be heard by humans. There is some debate about whether ultrasonic collars are humane.a sharp nip on the neck. Most of us are familiar with citronella from anti-mosquito candles. I am not sure I would fancy a spray of Citronella up close.
Shock Collars
Shock collars arte plain and simple punishment, they give an electric shock whenever the dog barks...
Most trainers recommend having the dog wear it all the time so that when the dog barks and she doesn't stop immediately, give the collar a tug. When the dog barks, the device emits a tone that acts as a distraction that startles the dog to stop it from barking. They compress the dog's windpipe and for that reason I personally don't like them.
For collars the sound is set off by the dog wearing the collar; however there have been cases of these being set off by other dogs' barking, Ultrasonic Transducer Manufacturers or even other loud noises. It seems a reasonable step to try if you are running out of ideas and training hasn't worked