Table 2 CODD grading system from Angell et al. [31] used in this study

0

Healthy foot

1

Focal lesion, either proliferative or erosive/ulcerative, affecting the digital skin and coronary band. No underrunning of the hoof capsule

2

Separation between the hoof capsule and the lamellae affecting < 50% of the hoof wall. Swollen digits. Subcorneal tissue haemorrhagic often with purulent material adherent. Foul smell

3

As grade 2 but affecting 50–100% of the hoof wall

4

Horn beginning to regrow. Exposed subcorneal tissue roughened, haemorrhagic/necrotic, friable and easily traumatised. Affected digits often distinctly swollen and shortened

5

Horn regrown, surface smooth but distorted by circumferential ridges or creases. Digit often still wide and short