Dogs, with their 300 million olfactory sensors, have an extraordinary sense of smell.
More than 250 words, movements, and even facial expressions are understood by dogs.
The Chihuahua, at a mere 2 to 6 pounds, is the tiniest canine breed in the world.
Dogs sweat through their paws and release heat by panting.
In comparison to human ears, a dog's is four times more acute.
Dogs have a specialized membrane in their eyes that allows them to see better in low light conditions.
The tallest dog ever recorded was a Great Dane named Zeus who measured 44 inches tall.
Dogs can sense body changes like low blood sugar in diabetics and some cancers.
The Basenji dog breed is unique in that it does not bark, but rather makes a yodeling sound.