Diseases of the dog and Diseases of the dog and their treatment diseasesofdogthe01ml Year: 1897 INFLAMMATION OF THE EXTERNAL EAR. 379 Fig. 84. and an exudation of a serous and, later, a purulent secretion, in the chronic course. We may also have the formation of abscesses and contraction of the meatus (caused by thickening of the cutis, by granulations, and by polypous malformations). Although we may have acute inflammation of the canal extending deep into the lining, it is very rare that the tympanic membrane becomes ulcer- ated and perforated. Etiology. The causes are similar to those ment
Diseases of the dog and Diseases of the dog and their treatment diseasesofdogthe01ml Year: 1897 INFLAMMATION OF THE EXTERNAL EAR. 379 Fig. 84. and an exudation of a serous and, later, a purulent secretion, in the chronic course. We may also have the formation of abscesses and contraction of the meatus (caused by thickening of the cutis, by granulations, and by polypous malformations). Although we may have acute inflammation of the canal extending deep into the lining, it is very rare that the tympanic membrane becomes ulcer- ated and perforated. Etiology. The causes are similar to those mentioned under eczema. It is due to an accumulation of cerumen, dirt, and cuta- neous scabs. It is also recognized that otitis is produced by acari. (See Parasitic Otitis, page 381.) Hoffmann states that he has observed serious suppuration in cases where dogs' ears have been clipped too close to the head. Clixical Symptoms and Prognosis. The animals shake their head, and, as the disease is almost invariably located in one ear only, they hold their head in an oblique position, trying to scratch the head against the base of the ear or to rub it against some object. They avoid carefully any attempt which is made to touch the ear, and show great pain when the tube of a concha is touched. In examining the external ear we use a forceps-shaped speculum or ear-mirror (Fig. 84). If we distend the canal, we generally find it filled with a fetid, grayish-green, or reddish liquid consist- ing of glandular secretions, fungi, cutaneous scabs, pus, acari, etc. After the organ is cleaned out we find an intensely red, swollen, sometimes ulcerating surface of the skin. In advanced cases the meatus is almost entirely closed by thickening of the cutis. Numerous granulations appear quickly, and in some cases where both ears are affected we may have symptoms of impaired hearing or deafness. According to Hoff- mann, in deep suppurating conditions we hear a characteristic smacking or sucking liquid sound
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