I'm so glad you called the police. Hopefully the dog will get a better home, for the owner obviously does not know how to take care of his/her dog if they tied her up outside with nothing to eat or drink. I feel bad for the poor puppy. I hope she can get a home where she can have equal access to outdoors and indoors, lots of yummy food, and of course not be tied/chained up outside.
I can't believe someone could do that!!