What Is That Sound Which So Thrills The Ear?

Several days ago I was browsing Youtube on my iPad when I came across the following squeaky toy sound effect, http://www.youtube.com/watch?v=9U86c2Zf5og. My guide dog, Trigger is a lover of squeaky toys and has often driven me half mad running up and down my flat excitedly squeaking one of his toys, his tail wagging furiously. Given Trigger’s love of things which go squeak in the night I was interested to see how he would react to the Youtube clip.

On clicking on Youtube, Trigger jumped out of his bed and looked around a puzzled expression (well as puzzled as any canine can look) on his face. He then proceeded to investigate my iPad with his nose but, eventually retired in disgust to his bed wondering why whatever was making that squeaking sound refused to be played with! Trigger is now wise to what is happening and hardly dains to lift his head when that new elusive squeaky toy starts it’s squeaking.