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Here are some interesting dog facts:

Dogs are descendants of wolves and were first domesticated over 15,000 years ago.

The world's smallest dog breed is the Chihuahua, while the tallest dog breed is the Great Dane.

Dogs have a sense of smell that is 10,000 to 100,000 times better than humans.

The average lifespan of a dog varies depending on its breed, but most dogs live between 8 to 15 years.

The most popular dog breeds in the United States are the Labrador Retriever, German Shepherd, and Golden Retriever.

Dogs can understand human emotions and often try to comfort their owners when they are upset.

The record for the longest dog tongue is held by a Great Dane named Mochi, whose tongue measures 7.3 inches.

Dogs have been trained to perform a wide variety of tasks, including search and rescue, therapy, and law enforcement.

The term "dog days of summer" comes from the ancient Greeks and refers to the period of time when Sirius, the "Dog Star," rises with the sun.

Dogs have three eyelids - an upper lid, a lower lid, and a third lid called a nictitating membrane, which helps keep the eye moist and protected.