I don't know how we ever lived without the bark collar. Our beautiful 2 year old Kelpie x Whippet has a heart of gold but a bark that will drive you insane. We tried puppy school, in home personal training and hours and hours of discipline and nothing worked to stop the barking. We received complaints from neighbors (Strata complex) about her barking and were running out of options and patience. The barking collar worked in just 2 days. Its unbelievable. We still have the same beautiful and happy dog, although now we just don't have the constant barking. No one can believe the difference this amazing little device has made. We originally did the rent option but it's the best money you will ever spend and you will keep it. Thank you very much you are a life saver guys!