INFLAMMATORY AFFECTIONS 313 
the disease brings about a deformity of the whole of the 
foot. Its longitudinal and transverse diameters become 
enormously increased, and the whole foot apparently 
flattened from above to below (see Fig. 186). This indi- 
cates that not only has the horny sole been entirely 
destroyed, but that the destructive process has also extended 
to the greater part of the lower half of the wall, with 
a consequent hypertrophy of exposed soft structures, and a 
sinking of the bony column, similar to that which occurs 
in laminitis, but not so pronounced. 
Fic. 186.—Foot with ADVANCED CANKER. 
A further aspect of the badly-cankered foot is to be found 
in an apparently enormous increase in the length of the 
wall. This we have seen protruding for quite 5 inches 
beyond the plane of the sole. It simply indicates that, 
in order to keep the animal at work, the smith has at every 
shoeing spared the wall, so that the diseased structures 
might be kept from contact with the ground. 
As we have said before, pain and other symptoms of 
distress are quite absent. Animals affected with canker 
for a long time maintain their condition, feed well, and 
are quite capable of performing work under ordinary con- 
ditions. 
