Dogs can understand up to 250 words and gestures, making them highly trainable and intelligent animals.
Dalmatians are born completely white and develop their spots over time.
Dogs have a sense of time, and can sense when their owners are due to arrive home.
The oldest known breed of dog is the Saluki, which has been around for over 7,000 years.
Some dogs can run up to 45 miles per hour, making them faster than most humans.
Dogs' sense of smell is 1,000 times better than humans', and they can detect odors up to 40 feet underground.
The smallest dog breed is the Chihuahua, which can weigh as little as 2 pounds.
Dogs have a third eyelid called the nictitating membrane, which helps protect their eyes and keep them moist.
The world's largest dog breed is the Great Dane, which can weigh up to 200 pounds.