Sounds like sirens, some kinds of whistles, and probably pipes for some reason grate on dog's ears, I think. My dog loves to hear me sing and play the guitar - always listens to my practice sessions attentively. But your dog may have chewed your pipes just because he (she) likes to chew. When mine was younger she chewed everything - furniture, shoes, hats, you name it! She did outgrow that eventually.