1: Dogs have been man's best friend for over 15,000 years.

2: There are over 340 different dog breeds worldwide.

3: Dogs have an incredible sense of smell, 10,000 to 100,000 times better than humans. Page4: Dogs have three eyelids, one for protection, one for lubrication, and one for blinking.

5: The Basenji dog is unique as it cannot bark.

6: Dogs have a sweat gland in their paws.

7: Dog's nose prints are as unique as human fingerprints.

8: Dogs dream just like humans and can even have nightmares.

9: The world's oldest known breed is the Saluki dog, which dates back to ancient Egypt.