Table 1.

Classification of wall horn overgrowth (NA = not applicable).

Assessment	0	1	2	3
Severity of wall horn overgrowth (scores 0–2, per claw)	no overgrowth	moderate; <50% of sole surface covered by overgrown wall horn	severe; >50% of sole surface covered by overgrown wall horn	NA
Overall score of wall horn overgrowth	0–16; summed-up score per animal
Direction of overgrowth	NA	to the axial side	to the abaxial side	to the axial and abaxial side
Origin of overgrowth	NA	abaxial wall horn	axial wall horn	axial and abaxial wall horn