Fig. 1
From: Unaltered sequence of dental, skeletal, and sexual maturity in domestic dogs compared to the wolf
Tooth eruption (a, b) and growth plate closure (c, d) stages. a Stage 1 (left arrow), unerupted, the tooth is not visible above the alveolus; stage 2 (right arrow), erupting, the tooth crown is visible above the alveolus, but not yet in occlusion. b Stage 3, erupted, the tooth is in the occlusal plane and the enamel-cementum junction (arrow) is visible above the alveolus. c Stage 0, open growth plate (arrow). d Stage 1, closed, outer surface is at least in part obliterated by bone