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.
I found a website that
has good drawings and lots of information on the
technical aspects of how dogs ears work. You can
read that information and see those pictures
Dogs hear at a wider range of frequencies than
humans.The low end of the range is similar: 67 Hz,
but dogs hear noises up to 45 kHz, while humans
only hear sounds up to about 23 kHz. This means
that they could be hearing and responding to
sounds that we can't hear at all.
For some reason, humans have not had to in their
evolutionary history hear as well as dogs do, so
humans don't. Why, in terms of our organ
structure? I would guess because of the way that a
dog's ears reflect sound that our ears do not, but
that is just a guess.
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