You wouldn't want to know
how common is this sort of unspeakable neglect. Puppies bought to 'entertain' kiddies, for a present. Kid takes no responsibility; puppihood cuteness fades and dog remains untrained, then is moved to back yard. 'Toy' is forgotten - imagine the lesson this makes re later sensibilities. I suppose that such people are automatically attracted to MBA schools; spreadsheet minds with spreadsheet animals.
I have friends who are involved in mitigating whatever they can; shovelling Shit against a tide of cluless, insensitive clods. What they do is - save one at a time. Anyway. (Narcissism? this one is about the vanity of ownership of a thing, especially evident re the exotics - like wolves and their relatives. Few people are temperamentally suited to be around many such animals and will invest little effort in learning about them. But $$ will get you one anyway)
Sorry, no solution comes to mind. It's an area where one hopes there Is karma. Can you bring the dog some decent food, see there's water in dish? Substitute a bit longer chain? (screw the permission) Just your presence for a few minutes could only be a merciful act. As I know you realize, most animals are more emotionally aware (of human feelings too) than '04 consumers are, of anyone's emotional state. Animals don't have all that human backgound noise, Walkmen and the like. And they certainly *feel* neglect. Cruelty is the exact right word.
Confront owner? Some retain a vestige of 'shame' from childhood, as can be evoked.
I do like the idea of the owner trading places, for about two weeks. So it's kidnapping.. So???
Condolences.