Aboistop compact aboistop compact citronella collarspecial offer get a universal gas refill and spare battery worth pound1298 with every collar orderedunderstanding your dogbarking is a natural form of behaviour for a dog a dog that barks to give warning of an intruder or a danger or to communicate his joy to his master is simply expressing his emotional state however if your dog forms the habit of barking at the slightest external provocation this behaviour becomes distressing not only to you o