Uncommon Senses

(from DogFancy Magazine):

The average dog detects sights, sounds, and smells that are inaudible,
invisible, and, well, unsmellable to us.

Dogs spot distant moving objects better than we can and have wider fields
of vision. But it's at night their eyes shine--literally. A reflective membrane
in the back of each eye improves vision in dim light--and creates those scarey
"devil dog" snapshots. But don't let dogs choose your clothes; they can't
distinguish green from red or gray, although they can tell blue from yellow.

Dogs hear high-frequency sounds we can't......Dogs hear sounds farther
away than humans can, so they recognize a familiar car coming to your
house several seconds before you hear it. Also, dogs have more than a
dozen muscles to tilt, turn, and raise their ears to improve reception.

Dogs have about 25 times as many scent receptors as humans, enabling
them to detect a single drop of human blood in five quarts of water.