In The Case of the Barking Dogs, the tree house detectives have yet another mystery to solve. Many of the neighborhoods in Big City are experiencing a problem with their pooches barking late at night and early in the morning. The barking is even affecting some of the tree house detectives. They have a big test soon and they need to get some sleep! The tree house detectives visit their friend Dr. D, a retired science professor, for advise on where to start their investigation. With his direction, the tree house detectives go on many excursions to speak with various NASA Researchers, an audiologist, a veterinarian, and even their classroom teachers to get help solving the case. Along the way, they learn more about sound: what it is, how it is transmitted, and how people and animals hear. With a few clues from the local news station, KSNN (Kids Science News Network), the tree house detectives are able to use scientific inquiry and the scientific method to solve the mystery.
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