My 2 years old Bella thinks she own the street and no one is allowed to pass by our house not even neighbors dogs are allowed outside lol, it was a big problem for us especially in the summer time where all the fur babies and their parents are often outside, she would bark non stop any time of the day, it was driving us and everyone around us crazy, i said let me try this product give it a try, let me tell u, sometimes if my screen door is open I cannot tell if Bella is inside or outside, it’s a miracle, the instructions says to put it on the dog for at least 12 hours a day which we did, now sometimes I forget to put it on her she still wouldn’t bark, maybe once or twice throughout the entire day, which is not bad at the end of the day it’s ok for her to bark just to let it out she needs to be herself, but nothing like before she actually got used to it and she doesn’t mind wearing it, give it a try u will love this product, I have our setting on vibrate it’s gentle it beeps first then vibrates,