-Dogs have been around for at least 14,000 years.
-Dogs have more than 100 different vocalizations (humans have about 9).
-A dog's nose is 10,000 times more sensitive than that of a human.
-Dogs process odours in their brain differently from humans; they process them through smell instead of sight or sound.
-Dogs can hear sounds up to four times higher than humans can hear them (up to 40 kHz).