True to their word, this collar stopped my mischievous pooch with her night time woofing in 10 minutes. I only put it on her at night but because the collar has taught her that woofing is undesirable, she has even stopped her nuisance barking during the day! I bought a cheaper collar and never put it on my pooch because it just didn’t seem safe or controlled at all. I have seen this collar in action though and it is extremely gentle and only increases if she doesn’t stop barking. This is undoubtedly the only collar I would trust. I have also used one in previous years and found it to be equally as safe and effective. I was concerned that collars were too harsh but because this is super gentle and only increases if necessary, I feel totally comfortable with it and so does my pupper.