1. Dogs have been human companions for at least 15,000 years, our oldest domesticated animal.

2. A dog's sense of smell can be up to 100,000 times stronger than a human's.

3. Dogs can understand more than 150 words and can count up to about five.

4. A dog's nose print is just as unique as a human fingerprint.

5. The Basenji is one of the only dog breeds that does not bark - it yodels instead.

6. Dogs curl into a ball while sleeping as an instinct to protect their organs from predators.

7. Puppies are born deaf, blind, and toothless, relying completely on their mother.

8. Greyhounds can reach speeds up to 45 miles per hour, rivaling cars in short bursts.

9. A dog's average body temperature runs higher than ours, around 101 to 102.5 degrees Fahrenheit.

10. A dog's whiskers help it sense nearby objects and shifts in airflow, almost like a sixth sense.