This type of device typically operates from a collar that contains a small canister of citronella liquid which is sprayed in the dog's face after each bark. It's not hard to believe that your average dog would find this annoying enough to re-think his ba Best Rechargeable Bark Collars rking habits, especially considering the fact that dogs are believed to just hate the smell of citronella. This is another painless bark control alternative if you don't mind the of the collar plus the ongoing expense of keeping the canister full. Some pet owners also have concerns with this type of collar, since your dog is sprayed directly in the face every time he barks.