QUOTE(viola-mad @ Oct 13 2009, 08:43 PM)

QUOTE(AmandaL @ Oct 9 2009, 01:46 PM)

In reality, we have absolutely no idea what effects these sounds and vibrations have on animals. Their bodies are equipped with senses (sight/smell/hearing/touch) far more delicate than those of a human.
Amanda, I think you're onto something here - and perhaps it's not not just the sound the cat objects to. My mum has a sweetheart of a 20-year-old cat who is quiet as a mouse and deaf as a post (hasn't answered to a call for years and leaps into the air if you approach him from behind and then touch him). He happily sits next to people playing the piano but he yowls when I play certain things on the viola - that wretched 3rds scale just as an example. I can feel the vibrations in the air myself and I really like it - but unfortunately the cat doesn't seem to find it pleasant. Maybe something to do with the vibrations from my out-of-tune-ness grating against each other?
Well, just as humans find some sounds disturbing or uncomfortable, other creatures from the animal kingdom also feel the same. The definition of 'pleasant' is subjective, hence why we don't all like listening to the same thing. Take those smells, sounds, or vibrations and place it into the world of cats and dogs, and every one of their senses is in the region of 200 times greater than that of a human. Imagine how easily overloaded their body must feel and their need to escape, ie. leave the room or the house.
Though not directly related to domestic pets, human sound polution is how whales and even dolphins become 'deafened' by sonar emissions from so many submarines and ships. Because WE can't hear it, doesn't mean to say other creatures can't - sonar is how whales and dolphins communicate to each other, assess their location and in the case of dolphins, seek out their food! How distracting is that? It must be like trying to sing to yourself while having to listen to a din of background noise at maxumum volume.
As an example of just how distracting it must be for animals, imagine what it would be like for your ears to be able to 'hear' radio signals without needing a radio! You'd be bombarded with a constant wall of sound made up of all the transmissions currently being made. Now imagine how uncomfortable that would be if there was no way to shut those sounds out, other than to move to an area where radio signals were difficult to detect. This is what many animals experience when we start scraping/blowing/hitting what we call musical instruments. Just as some sounds can be used to attract animals, others can have quite disturbing effects on them.