Wireless Dog Fence Containment System Extra Collar For KD661/KD663

Very boisterous 8 month old Lab puppy with some unacceptable but hard to break habits. I debated for quite a while about buying this collar due to the price. It's been worth every penny. 5 days after first wearing it and the Labrador is much calmer. Her most frequent bad behaviour (playful attacking an older dog when going into the garden) ceased within a day. Less repetitive bad habits are taking longer to break, but the puppy is calmer and definitely more responsive. Everyone is happier. Just wish I'd bought it sooner!!