Track and Paw Illustration Of Length
Length of Dog Track


Relating to, or located towards, the center of the main body.

In the case of an appendage, such as a limb, this is towards the point of attachment to the main body.

Proximal Direction Illustrated by Dog Paw

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Length (of a Track)
The distance from the proximal  edge of a track to the distal  point or edge (leading edge), measured parallel to the foot axis.
Cf. width (of a track)

Dog Footprint in Sand Illustrating Length

Dog Track in Sand (Illustrating Length of a Track)