If you think you want it, start a conversation with the neighbor about dogs and how much you have always admired dogs like that and are thinking about getting one. If they really don't like it they'll probably start bitching about the dog and say, "if you want one take mine". I've actually had people say this to me when I meet them and their pet on a walk or in the park. Then you say sure I'd love to! Some people just don't want to give up a dog even if they dislike it. Otherwise, yes, call the authorities. Dogs should have shade and water at least in your area.
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