I found some very helpful information on the web
about dog hearing. I hope this helps you.
hear at a wider range of frequencies than humans.
The low end of the range is similar to humans
(humans hear down to about 20 Hertz, or cycles per
second, dogs are at about 40 Hz). But at the high
end, they are quite different. Humans hear to
about 23 KHz or 23,000 Hz (kilohertz = 1000 x Hz)
but dogs can hear up to 45 KHz! Although as dogs
age they may become deaf and some dogs are born
When dogs become aware of a sound they've
heard their ears will prick up and move around.
Part of the reason why dogs can hear better than
humans is that their ears have more mobility which
enable it to maximize its ability to ear. The
shape of a dog's ear also helps it hear more
proficiently. As we cup our ears, some dogs ears
are already in that position. A German Shepherd,
for example, has upright curved ears which helps
it to maximize sound.
The following link to Wikipedia has interesting
information about the dogs' anatomy and their