Photo: M. Rehemtulla, Wikimedia Commons, CC BY 2.0.Test your knowledge on man's best friend! From history and science to pop culture and anatomy, discover how much you really know about our oldest animal companions.
Treat Seeker 0–4 · Pack Explorer 5–8 · Alpha Historian 9–10
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Cerberus is the fearsome multi-headed dog of Hades who guards the entrance to the Underworld to prevent the dead from escaping and the living from entering. While most accounts describe him with three heads, some ancient poets claimed he had as many as fifty or even a hundred heads.
Photo: Eagle Painter, Wikimedia Commons, Public domain.
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Dogs have dichromatic vision, meaning they have only two types of color receptors in their eyes, compared to three in humans. This allows them to see shades of blue and yellow, while red and green look like gray or brown to them. This is why a bright red toy might be hard for a dog to spot in green grass.
Photo: Caronna, Wikimedia Commons, CC BY-SA 3.0.
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Laika, a stray mongrel from Moscow, made history on November 3, 1957, when she was launched into space aboard Sputnik 2. Although she did not survive the flight, her journey paved the way for human space exploration. Later, other dogs like Belka and Strelka successfully returned to Earth.
Photo: Музей космонавтики / Главархив Москвы, Wikimedia Commons, CC BY 4.0.
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Toto was played by a female Cairn Terrier named Terry, who was paid more per week than many of the human actors playing Munchkins. Terry suffered a broken foot during filming when one of the Winkie Guards accidentally stepped on her, but she made a full recovery and attended the film's premiere.
Photo: William Wallace Denslow, Wikimedia Commons, Public domain.
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Just like human fingerprints, the pattern of ridges and creases on a dog's nose is completely unique to each individual. Some kennel clubs and recovery services have used nose prints to identify lost dogs. This method is incredibly reliable because the pattern does not change as the dog ages.
Photo: M. Rehemtulla, Wikimedia Commons, CC BY 2.0.
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The Basenji is known as the barkless dog because its unusually shaped larynx prevents it from making a traditional barking sound. Instead, they make a unique sound often described as a yodel or a 'barroo'. They are also known for their cat-like grooming habits and lack of typical dog odor.

Photo: fugzu, Wikimedia Commons, CC BY 2.0.
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Barry der Menschenretter was a Saint Bernard who worked at the Great St Bernard Hospice on the Swiss-Italian border. The most famous story says he carried a young boy trapped in the ice to safety on his back, although the museum that keeps him calls that tale a legend. Today, his preserved body is displayed at the Natural History Museum of Bern.
Photo: Book: James Watson, Wikimedia Commons, Public domain.
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The Pekingese is named after Peking, the old name for Beijing, where it was a favourite of the emperor's court in the Forbidden City. The smallest ones were carried around in the wide sleeves of royal robes, so they were called 'sleeve dogs'. A Chinese legend says Buddha created the breed by shrinking a lion to the size of a little dog.
Photo: SheltieBoy, Wikimedia Commons, CC BY 2.0.
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Dogs have an amazing sense of smell, partly thanks to Jacobson's organ located inside the nasal cavity above the roof of the mouth. It acts as a secondary chemical communication system, helping them read pheromones from other animals. Interestingly, when a dog uses this organ, they might curl their lip slightly to expose it to the air.

Photo: Henry Vandyke Carter, Wikimedia Commons, Public domain.
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Dalmatian puppies are born with pure white coats, with no spots visible at birth. Their signature spots begin to appear on their skin and fur when they are about ten to fourteen days old, and continue to develop and darken as they grow.

Photo: Bradlien, Wikimedia Commons, CC BY-SA 4.0.
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