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Quick Answer. According to WebMD, a typical adult dog has 42 teeth, including incisors, canines, premolars and molars. Each jaw has six incisors in the front, one canine at each end of the incisors and eight premolars. The back of the top jaw has four molars, while the bottom jaw has six.
Dogs have two sets of teeth: 28 deciduous (baby) teeth, which will eventually be replaced by 42 permanent (adult) teeth. When a puppy is two or three weeks old, the deciduous teeth begin to erupt through the gums, starting with the incisors, followed by the canine teeth, and finally the premolars. All of the deciduous teeth should be in place by about eight weeks of age. These first teeth are small, and painfully sharp, as owners of young puppies know. This is part of the reason most mother dogs begin to wean their pups at five or six weeks of age.