How can I tell how big a German Shepherd puppy is? The German Shepherd puppy is usually judged by the condition of the teeth: 20-60 days in the long mammary teeth stage, after 8 months of age, all replaced by permanent teeth, 1 year old teeth white solid; 1-4.5 years old can be observed incisor cusps gradually worn out; 4.5-10 years old canine teeth gradually wear oval, 16-20 years old canine teeth gradually lost, until fallen out. 20 days or so mammary teeth gradually grow out. 4 to 6 weeks of age, mammary incisors full. At 2 months of age, all 28 milk teeth are complete, thinly pointed and softly white, and at 8 months of age, all teeth are replaced with permanent teeth. At age 5 years, the cusps of the third mandibular incisor were slightly worn, while the first and second mandibular incisors were worn to a rectangular shape. At 16 years of age, the incisors were lost and the canines were incomplete. 20 years of age, the canines were lost.
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