Body Structure

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3 weeks

9 weeks

12 weeks

4 months

5 months


6 weeks

Deciduous teeth


6 months

begin to erupt

fully erupted

Permanent teeth

begin to erupt

fully erupted


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Lecture Notes

This timeline illustrates when the deciduous and permanent teeth erupt in cats and dogs. The deciduous teeth typically erupt around 21 days of age and are fully erupted by five or six weeks. The permanent teeth, then, erupt to replace the deciduous teeth around four months and are completely erupted by six months.