My sister's Doberman puppy caught her collar on the handle of their buffet and we were all sitting at the kitchen table. She knocked the entire buffet and all of the contents on top of us! It happened so quickly, I saw exactly what had happened but was not able to prevent it. Once she was caught she just started pulling and chocking herself. It was the scariest thing you could even imagine! She no longer has collars on either of her dogs. I can't even imagine what would have happened if we were not right there! I'm sure she would have seriously hurt or even killed if it had happened when they were home alone.