DISEASES OF THE EAR. 541 



should be poured into the ear, and the dog's head held firmly 

 until it insinuates itself as deeply as possible in the passages of the 

 ear. Zinc sulphate and alum are useful, and should be applied 

 in the proportion of six grains of either to the ounce of water. A 

 solution of the perchloride of iron is a very effectual remedy. 

 Should the disease continue after this treatment, nitrate of silver 

 in the proportion of five grains to the ounce of water should be 

 employed. The animal should receive good food, and the fol- 

 lowing tonic should be used to improve his general health: 

 Strychnia, grains two-fifths; essence of pancreatin and pepsin, of 

 each two ounces. A teaspoonful to be given after meals. 

 AVhen it becomes very painful and acute, the animal howling 

 with a pain, a seton should be inserted behind the ear. If the 

 fever is A^ery great, nitrate of potash, etc., may be used in tAventy- 

 grain doses> 



EXTERNAL CANKER. 



This is an abraded or wounded condition of the ear. It is 

 caused by the dog shaking his ears, or from accidental injury. 

 It is rarely found in other than long-eared dogs. It may first 

 appear as a very small, trifling wound, but from constant flap- 

 ping the wound grows larger and the ear commences to split. A 

 .netting should be worn over the ears to prevent the dog shaking 

 them. He must not bo allowed to go in the water. The remedies 

 recommended for internal canker may be used in external canker. 



If the ear be split to any depth, and if after removing the cap 

 the wound separates, the edges must be pared and brought to- 

 gether with metallic sutures. 



POLYPUS. 



Polypi sometimes seen in the car of the dog may be removed 

 with small scissoi's and ligatures of wire or silk. When removed, 

 the base of the tumor should be destroyed by the nitrate of silver; 

 it may be necessary to repeat the application. Tumors are some- 

 times seen in the flaj") of the ear, and may extend from the base 

 of the car to the lip of the flap. 



