- The oldest known dog bones were found in Asia and date as far back as 10,000 B.C. The first identifiable dog breed appeared about 9000 B.C. and was probably a type of Greyhound dog used for hunting.
- There are an estimated 400 million dogs in the world.
- The U.S. has the highest dog population in the world. France has the second highest.
- Dog nose prints are as unique as human finger prints and can be used to identify them.
- Bloodhound dogs have a keen sense of smell and have been used since the Middle Ages to track criminals.
- It is much easier for dogs to learn spoken commands if they are given in conjunction with hand signals or gestures.
- Dogs in a pack are more likely to chase and hunt than a single dog on its own. Two dogs are enough to form a pack.
- Dogs can see in colour, though they most likely see colours similar to a colour-blind human. They can see better when the light is low.
- Petting dogs is proven to lower blood pressure of dog owners.
- Zorba, an English mastiff, is the biggest dog ever recorded. He weighed 343 pounds and measured 8′ 3″ from his nose to his tail.
- The average dog can run about 19 mph. Greyhounds are the fastest dogs on Earth and can run at speeds of 45 mph.
- One female dog and her female children could produce 4,372 puppies in seven years.
- The oldest dog on record was an Australian cattle dog named Bluey who lived 29 years and 5 months. In human years, that is more than 160 years old.