IMPORTENT FOR GOOD RESULTS The barking collar must be close to the dogs throat, is it too loose the ultrasonic sensor on the back will trigger when other dogs bark. We recommend a finger thickness from neck to collar. Each dog is different, but usually it takes no more than 14 days for them to changes there behavior and get used to their new anti bark collar. HUMANE BARK COLLAR This barking dog deterrent is so light and safe, a little tiny puppy can train with it. Teaches your dog to stop barking with a combination of beep and vibrations. ADJUSTABLE COLLARS FROM PUPPY TO FULLY GROWN The stylish anti barking device is discreet and looks the part on all dogs. Effective for small dogs from 12 lbs to medium and large dogs up to 110 lbs. Fits 9 inches to 22 inches neck size. The quality trap adjusts easily NEW UPGRADED 2018 CHIP The new bark collar chip is not activated when other dogs are barking, is triggered by vibrations from your dog’s vocal chords rather than just noise like cheaper collars. The 7 vibration and ultrasonic levels are easy to use 365 DAYS EXTRAORDINARY SERVICE - We are sure you will love your anti barking collar, never the less we will be stand by, 24 hours a day 7 days a week, if you have any questions it is just to reach out. While other brands only give you 30 or 60 days, we give you a full year Manufacturer Guarantee.