There is always at least three sides to every story.....
No one can say for certain what happens 24/7. If it is a rental, and the dog spends some time inside.... It would be highly unlikely they would admit that to an agent. Without 24/7 observation or speaking to the owners no one will really know whether it gets walked at odd hours or not. It may not be a nice situation, but that may be the owners only option and it may only be a temporary one... Let the authorities assess that. They will also be able to make the judgement over whether the dog is distressed or not.
If OP feels strongly about it then she can make the relevant phone calls.
When we bought our current rural acreage we had to keep our dogs at boarding kennels for a month until we had completely redone the farm fencing. I know the kennels only let them out for a run a couple of times a day and I am sure that our dogs would have been very ticked off at being locked up. When we finally got them home we still had to confine them to their kennels we had built when we weren't outside with them or they weren't inside with us as they had never been around cattle or sheep (the neighbours) before. If they had become too boisterous and interested in the livestock and escaped to harass the livestock then I would have no doubt they would have been shot by a farmer. At that time, my dogs had a similar amount of 'freedom' to what is described in the original post here.