1. Did you know that a dog's only sweat glands are on his footpads? A dog's primary method of cooling off is through panting, making dogs less efficient at keeping cool than humans who have sweat glands all over their bodies.
2. One of the more interesting animal facts: A dog's noseprints are just like a human's fingerprints -- unique. Just like fingerprints, noseprints can be used to accurately identify the owner of that nose.
3. Humans have been keeping dogs as pets for more than 12,000 years. No wonder they are known as "man's best friend" -- they are his oldest friend!
4. The largest dog breed in the world is the Irish wolfhound; the smallest is the Chihuahua. The St. Bernard is the heaviest breed of dog.
5. The Basenji, an African wolf dog, is the only dog in the world that cannot bark. If you're looking for a quiet dog, the Basenji would be a good choice.
6. A dog's sense of smell is over 100,000 times more sensitive than a human's. The bloodhound is best known for its keen sense of smell and tracking abilities, and is often used by law enforcement.
7. Puppies sleep a lot. They actually sleep about 90 percent of the day for their first few weeks.
8. Dogs have twice as many muscles in their ears as humans. This is why they are able to move their ears around so well, but people can't. It would be a cool ability for humans, though!
9. Dogs have an amazingly keen sense of hearing; it's their second most developed sense after smell, of course. A dog can detect sound frequencies in the range of 67 HZ to 45 kHZ. Humans can detect sound frequencies up to 20 kHZ.
10. Dogs are pack animals. They are naturally submissive to any person or other canine with a higher pack status. They also quickly and easily recognize this higher pack status in another dog or human. A dog will demonstrate its submission by laying down and presenting its belly to the pack leader.
For more interesting animal facts, visit your local library.