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This is what I found about a citronella collar:

Brand New Multivet Citronella Spray No Bark Collar

KIT11122

The Multivet Citronella Spray Bark Collar works without negative effects for the barking dog. Multivet has the safe and humane bark collar solution for situations where your dog's excessive barking has become a problem. Research data has shown that the second most common complaint received at local police stations (next to false alarms) are complaints about barking dogs! The result: police warnings, expensive fines, eviction notices and strained relationships with your neighbors.

Combining modern electronics and dog training modification techniques this citronella spray bark collar will stop excessive barking. The Multivet Citronella Spray Bark Collar is effective, safe and painless. It needs no human intervention to work and has no secondary negative effects. In fact the spray dog barking collar has a calming effect. The collar is comfortable and will fit dogs of all sizes.



How the Multivet Citronella Spray Bark Collar works:

The spray barking control collar targets your dog's ultra-heightened senses for immediate results.
Each time your dog barks, the microphone will detect the barking and the barking control collar releases a harmless citronella spray.
Your dog is instantly distracted by the sight, smell, sound, and sensation of the gentle spray collar and stops barking.
Your dog becomes conditioned to expect the spray and will instinctively refrain from excessive barking to avoid it.