Aboistop bark collar aboistop citronella bark collarspecial offer get a universal gas refill and a spare battery worth pound1074 with every aboistop collar ordered the best way of training without punishmentsuprisethe moment your dog barks a spray of citronella painless and harmless is released and surprises it the effect of surprise is sufficient to interrupt the dog in its bad behaviour in a few days the dog learns to keep quiet while wearing the collar and concentrate on more normal activitie