Trained my rescue Pitbull (disguised as a Labrador), in two days. Two year old rescue bitch, stated by the pound as having behavioural problems, Unable to walk her on lead, she lunged at dogs and I was unable to hold her. Ran away daily from the park, any direction least 1klm before someone phoned to say they found her. I'e trained many dogs but no success till the collar arrived. The transformation is miraculous. Only a couple of shocks, and she walks off lead, responds to the beep, no need for any other action. Have even taken the collar off completely. All the do owners in our local park cannot believe it is the same dog. THANKS