Diseases of the Ear. 



193 



cotton wool saturated with it and packed gently in. For 

 internal canker, the zinc lotion, 5 grains to the ounce of 

 water, applied three or four times a day, I find usually 

 answers better than anything else. If raw spots or 

 ulcerations are noted, the parts should be mopped with a 

 solution of nitrate of silver, and this may be repeated every 

 other day. In many cases after syringing with carbolised 

 warm water (1^40), the parts may with benefit be dusted 

 with the dry oxide of zinc. Equal parts of balsam of Peru 

 and ox-gall, daily dropped into the ear, has also been found 

 successful. When the disease extends to the bones of the 

 ear, humanity dictates an end to the creature's sufferings. 



In all cases of canker, whether external or internal, it is 

 absolutely necessary, in order to ensure success and rapidity 

 of cure, that the animal should be prevented as much as 

 possible from flapping, scratching, or rubbing the ears. For 

 this purpose a cap of wash-leather or stout calico (the 

 latter is coolest) should be placed over the animal's head 

 and tied under the throat (Fig. 21). ' It should be similar 



Fig. 21, 



DOG WITH CANKER CAP. 



in shape (with the exception of the ear portion) to a horse's 

 hood, and is kept much easier in position than the usual 

 three-cornered one. 



