CHAPTER XIII. 



DISEASES OF THE EAR. 



CANKER (External), POLYPUS, 



CANKER (Internal), DEAFNESS, 



SEROUS ABSCESS, SCURFY EARS. 



CANKER (External). 



There are few diseases which cause more trouble and annoy- 

 ance, alike' to owner and subject, than the one known as 

 " canker." All dogs are liable to this malady ; but long-haired 

 ones, and especially water-dogs, are those usually affected. 



The disease is generally divided into external and internal 

 canker. External canker is that which attacks the edge or 

 margin of the ear-flap. 



Internal is usually confined to the passage leading to the 

 ear proper. 



Both forms are the same in character, and may co-exist or 

 arise independently of each other. 



Causes. — Canker may be produced by external violence, 

 gross feeding, over heating food, plethora, uncleanliness. It 

 is frequently associated with mange. 



Symptoms. — The first generally observed is repeated 

 shaking of the head and flapping the ears. Examination 

 reveals the integument covering those organs red, puffy, and 



hot, and this condition is aggravated by the animal continually 



(185) 



