I am still, after all these years, amazed that my NDN have never experienced a dog attack. They have had 3 or 4 German Shepherds over the years I have lived here and I have NEVER seen any of them walked. They have a tiny garden, think smaller than your average lounge. They were loved in the emotional sense but never given the care they needed. They currently have at least one, may be two, and a smaller breed, not sure what it is as I have only seen that once and that was when it was being put in the car, presumably to go to kennels when they were going away. All the dogs were there their whole lives from puppyhood, I think one was PTS due to illness but AFAIK the others died of age/natural causes.
Sadly, this does not meet the level of neglect required for intervention, and I know this as the RSPCA told me so when I rang, concerned for their young children mainly.