After adopting my staffie cross boxer from the RSPCA in August I found the only fault she had was aggressive barking. She is 2 years of age so not too old to retrain. Whilst I was at work she would bark at anyone going past the house even on the other side of the road, and try to attach the dogs on either side of my fence. So to keep me and the neighbours happy I contacted the dog line. They were exceptional with their service also sending out the collar promptly and the follow up phone calls to see how I was going with the use of the collar. I would recommend anyone with a problem barking dog to use The Dog Line. Also they are not expensive, very reasonable prices. Very Happy. Jenny