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• The basenji, an African wolf dog, is the only dog that cannot bark.
• Irish Wolfhounds rank as the largest dog, and Chihuahuas as the smallest dog. The St. Bernard is the heaviest dog and other breeds range in size between these extremes.
• A dog can hear sounds 250 yards away that most people cannot hear beyond 25 yards. The human ear can detect sound waves vibrating at frequencies up to 20,000 times a second. But dogs can hear sound waves that vibrate at frequencies of more than 30,000 times a second.
• Dogs cannot see as well as humans and are considered color blind. A dog sees objects first by their movement, second by their brightness, and third by their shape.
• A dog's heart beats between 70 and 120 times a minute, compared with a human heart which beats 70 to 80 times a minute.
• A female carries her young about 60 days before the puppies are born.
• Many foot disorders in dogs are related to long toenails. Check your dog's nails once a month and trim when necessary, avoiding the vein.
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