Stop dog barking collars are designed to deliver an aversive whenever your dog is barking.
There are several different methods employed by stop barking collars and we recommend:

Citronella Anti Bark Collar

This collar contains a reservoir of citronella solution that sprays into your dog's face every time he barks. A citronella collar is considered humane and a recent study reported an 88 percent rate of success with the use of this collar.

Citronella Anti Bark Collar

The safe and humane way to deter excessive barking. This unique dog collar is equipped with a battery-operated, electronic bark-sensing unit, the adjustable collar releases an all-natural citronella spray when your dog barks. The harmless citrus smell and quick action of the spray mist startles and confuses the pet's highly developed olfactory sense, causing him to stop barking. Unit includes spray control receiver and collar, citronella spray refill (additional refills sold separately), battery, and operations manual. Manufacturer provides a lifetime warranty. Collar adjusts to fit necks up to 25". Spray will not function at temperatures under 25 degrees F. Citronella Bark Dog Collar by Premier Pet Products DETAILS HERE

You need BARK FREE!
Details Here Later this week 8 July 2007