Dogs and Cats Paws and Tracks

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Proximodistal Axis
A line drawn from the distal point or edge to the proximal point or edge.
In the example of a limb of a cat or a dog, the most distal point is the tip of the claw, and the most proximal point is the point of attachment of the limb to the main body of the animal.

English Bulldog Proximodistal Axis