You can buy at br br When you using The Dog Silencer. If within the first few days you notice your dog barking at the unit or barking more than usual, this is simply part of the learning process in which the dog associates its bark with the sounds emitting from the Dog Silencer. br br Your Dog Silencer is a training device. Some customers report seeing results within a few days, but most will see results in 2-3 weeks.