22 6 DISEASES OF THE DOMESTIC ANIMALS 



sticking up over them, or show more or less signs of inflammation. 

 In dogs and horses the patches may be covered with grayish scales 

 or crusts, while in cattle the asbestos-like scabs are often very 

 thick and are underlaid by a purulent secretion. The spots increase 

 by growth of the periphery while the disease disappears in the 

 centre. Itching is moderate; much less than in eczema or mange. 

 Treatment. — Since the disease is transmitted by contact, 

 patients should be isolated and the premises, clothing, bedding, har- 

 ness, cleaning utensils, etc., used on patients, must be thoroughly 

 disinfected and hair and crusts burned. The disease may be spread 

 from one part of the body to another by grooming when the disease 

 has once appeared. To begin treatment, the scabs or crusts must 

 be softened with sweet oil and removed by washing with tar soap 

 or green soap. Iodine is one of the best remedies. This may be 

 used by simply painting spots with the tincture, or by daily inunction 

 with a stiff brush of an ointment containing I dram of iodine to 

 the ounce of goose grease. Moussu recommends for cattle the 

 following prescription for local application, where the patches are 

 small and well defined : acidi carbolici, tincturae iodi, chloralis, 

 aa^i. When the disease is generalized, thorough washing of the 

 surface with green or tar soap and the application of the harmless 

 boric acid (oii) in alcohol (§x) and ether (§iii) may be useful; 

 salicylic acid in alcohol (i-io) is also efficient and not dangerous. 

 Many other remedies are curative, as sulphur ointment, and 10 

 per cent, ointment of lysol, creolin and tar. Unguentum hydrargyri 

 ammoniati is excellent in small areas. It is best to clip the hair 

 about the patch and pull out that on the diseased area if this is 

 feasible. 



Roaring. 



This affection is common to horses and rarely seen in cattle 

 and dogs. Roaring is usually due to peripheral neuritis of the 

 left recurrent laryngeal nerve, v with left-sided paralysis of the 



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