8 Oct., 1907.] 



Diseases of I'' arm Anifiials 



635 



DISEASES OF FARM ANIMALS. 



5. S. Cameron. M.R.C.V.S., Chief Veterinary Officer. 

 DISEASES OF THE FOOT. 



Contracted Heels — Thrush — Canker — Sand crack — False quarter — Seedy toe — Pricked 

 foot — Foot wounds — Quitter — Foot-Rot in Sheep — Foul in the Foot of Cattle. 



The important diseases of tlie foot of tlie hor.se associated with some 

 obscurity of lameness, viz.: — Sidebone, corns, laminitis, villitis, and 

 navicular disease, have already been dealt with in the chapter on Lameness 

 (p. 211, et seq.) There remain for consideration those diseases which 

 are not necessarily associated with lameness, or in which the cause of 

 lameness is patent, and there are also to be considered foot affections of 

 cattle and sheep. 



Contracted Heels. 



This is an abnormal condition of the foot in which the heels become 

 contracted or " wired in," the frog dry and shrivelled, and the growth 

 of horn at the heels uneven, soi that the coronets at the heel are not on 

 the same level. (See Fig. 103.) 



Fi-. 

 Hayes 



103. Sliod hoof witli contracted heels showni;^ shrinkage of froj. 



(After 



Causes. — The primarv cause of this condition is absence of frog 

 pressure, brought about b\ injudicious paring of the frog, and improper 

 shoeing. So long as the frog is allowed to come in contact with the 

 ground some amount of pressure will be exerted on it through the weight 

 of the animal; and so long will it continue to retain its proper size and 



