101 Facts… Dogs! Amazing Facts, Photos and Video Links to the World's Best Loved Pet. Quotes

“have at least eighteen muscles in each ear. Using these, they can move their ears to pinpoint where a sound is coming from.   Whereas humans can only hear sounds with frequencies of up to 20,000 hertz, dogs can hear sounds from 40,000 to 60,000 hertz.”
― IP Factly, 101 Facts… Dogs! Amazing Facts, Photos and Video Links to the World's Best Loved Pet.