I was cringing every time one dog would go to change direction and the other dog was there... just WAITING for one of them to grab the other. :-/ I'm not saying dogs have endless tolerance, or that Pit Bulls are exempt from having a threshold. However, the dogs in the video are not cornered. The dogs are actively engaging the children, with aggressive posturing and behaviour, even when the children are not throwing stones and are walking away. Now, I don't know how long this has been going on for... but simply from what I saw in the video, the reactions of the dogs are dangerous.