CHAPTER XXXII. 



DISEASES OF THE HEAD, NECK, VEINS, ETC. 



OTORRH(EA — EXTERNAL CANKER OF THE EAR — POLL-EVIL FISTULOUS 



WITHERS CIRCUMSCRIBED AND DIFFUSE PHLEBITIS THROMBUS 



VARICOSE VEINS — PHLEBOLITES — ENTRANCE OF AIR INTO THE 



VEINS. 



DISEASES OF THE EAR. 



With tlie exception of liability to accidental injuries — and 

 gangrene of the concha sometimes seen in scarlatina — the ear of 

 the horse seems exempt from disease; the dog, however, is 

 subject to two well-known forms of disease of the ear, namely, 

 internal and external canker. 



Internal Canker, Otorrhcea, is an inflammation of the lining 

 membrane of the meatus auditorius exfernus, with a discharge 

 of purulent matter, sometimes mixed with blood, which may 

 occasionally coagulate, block up the tube, and cause deafness. 

 When the inflammation extends to the internal ear it constitutes 

 " otitis," a most painful affection, causing constitutional disturb- 

 ance, in some instances delirium, coma, and death. The inflam- 

 mation of the mucous lining of the outer meatus is very often 

 aggravated, and otitis produced by irrational treatment. 



The disease occurs chiefly in spaniels and retrievers, but no 

 breed is exempt ; the practice of " cropping the ears " does not 

 seem to predispose to it ; indeed, it is mostly met wdth in dogs 

 with pendulous ears. The origin of the disease is local or 

 constitutional ; the local, caused by the lodgment of water, dirt, 

 or any foreign matter in the meatus ; and the constitutional, 

 arising from improper and over-feeding, want of exercise, catar- 

 rhal affections, and the extension of skin diseases. 



Treatment. — Wlien of local origin, the treatment must be 

 directed to the subjugation of the inflammation by local soothing 



