Love your videos! I live in United States and I have a blue heeler. To be honest, most behavioral issues especially for large breed dogs are because of boredom like you said in the video. Most families in HK love big dogs but they really don't have the space for them. They would survive and live, but it is not an optimal place. Golden Retrievers requires a large area to run in, fetch and retrieve, mental stimulation etc. Unless both the owners are at home all the time and willing to pay tons of effort to bring the dog out multiple times a day, behavioral issues are going to happen. My dog is about 50 lbs and my house is around 2000 square ft, with side patio and a backyard. Yet I think we are already pushing it as heelers are herding breed and they need space. Anyways, I hope all dogs can live healthy and happily :D