Dogs vary more in outward appearance than in anatomical structure. An adult dog may weigh 2 to 99 kg., depending on the breed, and range in height from 12.5 to 90 cm. at the shoulder. Other differences in conformation include length in leg; length in muzzle; size and attitude of ears; length, shape, and carriage of tail; and length, density, color, and character of hair.
The female, or bitch (not the human), reaches reproductive maturity between 7 to 18 months of age. the gestation period averages 62 to 63 days. An average litter consist of 3 to 6 puppies. Sightless at birth, puppies do not open their eyes until about the tenth day. They are generally weaned by the sixth week. A dog is full grown at the end of the second year, is old at 12, and seldom lives beyond the age of 20.
Dogs have long been mistakenly considered colorblind. While they are unable to differentiate colors ranging from greenish yellow though orange to red, recent studies have shown that they can distinguish between colors at opposing ends of the spectrum. A dog's most important sense, however, is that of smell. An adult dog has 42 teeth, including molars. to drink, a dog laps with its tongue. Dogs do not perspire; heat is dissipated though evaporation from the nose and footpads and from the tongue and respiratory tract(that is why they pant). The dog has a simple carnivore stomach but eats cooked vegetables and grain as well as meat.
The female, or bitch (not the human), reaches reproductive maturity between 7 to 18 months of age. the gestation period averages 62 to 63 days. An average litter consist of 3 to 6 puppies. Sightless at birth, puppies do not open their eyes until about the tenth day. They are generally weaned by the sixth week. A dog is full grown at the end of the second year, is old at 12, and seldom lives beyond the age of 20.
Dogs have long been mistakenly considered colorblind. While they are unable to differentiate colors ranging from greenish yellow though orange to red, recent studies have shown that they can distinguish between colors at opposing ends of the spectrum. A dog's most important sense, however, is that of smell. An adult dog has 42 teeth, including molars. to drink, a dog laps with its tongue. Dogs do not perspire; heat is dissipated though evaporation from the nose and footpads and from the tongue and respiratory tract(that is why they pant). The dog has a simple carnivore stomach but eats cooked vegetables and grain as well as meat.
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