"My husband and I have a 1 year-old Miniature Dachshund. He's 10 pounds, but barks like he's 40 (big and volumnous!)
We reviewed several products before settling on the spray (mostly because I am opposed to shock treatments as training methods.)
We purchased our first collar and it would inconsistently spray when he barked. I exchanged it for the exact same one and this one sprays every time. We follow the spray (once the dog is quiet) with a "good quiet!" and a treat so to reinforce the positive, quiet behavior and associate barking with being negative.
Within 3 days of getting the second collar, the dog is responding to the "good quiet" command and is much less vocal (which is definitely a good thing!) No more mixed signals like the first collar; he gets a consistent, "Barking is bad" and "Quiet is rewarded" message.
On a side note, we send our dog to daycare one to two days per week and I was glad to see our daycare uses this same collar on some of their more "vocal" clients (dogs, not owners.) They, too, do not use shock/stimulus-related treatments, so I felt good about using this collar in our home."