Under normal circumstances, the distribution of adult dog's permanent teeth: the upper and lower incisors of six, dogs age plus or minus 2, plus or minus eight premolars, molars, 4 maxillary and mandibular as 6, a total of 42. Quantitative distribution of juvenile dogs primary teeth: incisors plus or minus 6, the two upper and lower canines, premolars upper and lower 6, a total of 28. To determine the size of rough dog's age based on the following criteria:
About 20 days, the teeth gradually grow back unevenly.
30-40 days, milk incisor long-Qi.
2 months, their milk all the long-chai, which was tender whisper white.
2-4 months, replace the first milk incisor.
5-6 months, replace the second, third breast milk incisors and all canines.
8 months or more teeth, all replaced by permanent teeth.
1-year-old permanent teeth longer homogeneous, smooth, firm, the upper incisors are sharp sudden.
1.5 years old, the mandibular first incisor peak obliterate.
2.5 years old, the mandibular second incisor peak obliterate.
3.5 years old, maxillary first incisor peak obliterate.
4.5 years, peak obliterate the maxillary second incisor.
5-year-old minor peak mandibular third incisor wear, while the mandibular first and second incisor grinding was rectangular.
6 years old, the mandibular third incisor peak eroded canine blunt round.
7-year-old wear and tear to the mandibular first incisor tooth roots, wear appear before vertical oval.
8-year-old, the mandibular first incisor wear and tear to the front of the tilt.
10 years old, the mandibular second and maxillary incisor wear appear before the first vertical oval.
16-year-old incisor off, canine incomplete.
20-year-old canine shedding
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