Dog hair will still wrap itself around the brush and catch on the teeth, causing the cleaning robot to sound the alarm. Might be more useful in a household with a dog smaller than my golden retriever.
My original dust box door wouldn't close. It's time to replace. The new one is amazing as the teeth pick up long hairs etc that used to cling to the brushes and were difficult to clean. The teeth on the door make the hair problem irrelevant. Highly recommended