. Diseases of the dog and their treatment. n filling it in withtincture of iodine, and then keeping it clean and using an ear-cap. Simple emptying by means of a trocar or making a small incisionnever produces any good results, as the opening closes immediately andit soon fills up again. Sutures are not advisable, causing great order to prevent the too rapid closing of the incision, the removal ofa small crescent-shaped piece of flesh from the edge of the opening hasbeen recommended. 432 DISEASES OF THE EAR Ulceration of the External Concha.—External Canker. By this we mean a puru
. Diseases of the dog and their treatment. n filling it in withtincture of iodine, and then keeping it clean and using an ear-cap. Simple emptying by means of a trocar or making a small incisionnever produces any good results, as the opening closes immediately andit soon fills up again. Sutures are not advisable, causing great order to prevent the too rapid closing of the incision, the removal ofa small crescent-shaped piece of flesh from the edge of the opening hasbeen recommended. 432 DISEASES OF THE EAR Ulceration of the External Concha.—External Canker. By this we mean a purulent or ulcerative process on the edge of theexternal ear. This, however, is not contined to the edge, but may spreadover different parts of the lobe. Etiology.—The chief causes of this trouble are injuries and lacerationsof the skin. Dogs are liable to scratch or shake the ears violently againstthe muzzle or collar, producing an inflammation. It may also be devel-oped from the ear itself, as in cutaneous inflammations of the external. Fig. 154.—Mode of bandaging the ear. auditory passages. We may also see this as a of wounds or lacera-tions of the ear caused by bites of other dogs, which from neglect orimproper treatment become ulcerated and do not heal readily on accountof constant shaking of the ear. This affection is almost entirely confinedto animals with long ears and short hair. Clinical Symptoms.—The animals hold their heads to one side,shaking the ear frequently, sometimes keeping it up so long that theulcerated surface bleeds and the blood is thrown in all directions. Theyattempt to scratch the affected ear with their paws, and are very sensitiveabout having them touched. On makinu- an examination we find at the EXTERNAL CANKER 433 edf^e of the external ear, generally at its extreme end, an ulcer or anumber of them which are covered with a blackish loose scab withturned-up edges, and the tissues of the immediate neighborhood areoedematous. Therapeutic
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