CHAPTER XIV. 



DISEASES OF THE SKIN. EXTERNAL PARASITES. 



MANGE (Sarcoptic), RINGWORM (Honeycomb), 



MANGE (Follicular), WARTS, 



ECZEMA, FLEAS, 



ERYTHEMA, LICE, 



RINGWORM (Proper), TICKS, 



MANGE (Sarcoptic). 



The term " mange " is generally used by those people who 

 dabble in canine matters without the knowledge necessary to 

 diagnoze correctly, to denote any affection of the skin, which 

 results in eruption, irritation, or the detachment of hair. 



The true mange of the dog is analogous to the itch of 

 man, and the riff of the horse. It is due to the presence of a 

 small acarus {Sarcoftes cams) — Fig. 22. Another species 

 termed Follicular mange, is also very frequently met with in 

 dogs. This likewise is due to the presence of an acarus 

 {Acarus foUiculorum or Demodex caninus) — Fig. 23. 



Mange, of whichever species, can only be propagated by 

 the migration, directly or indirectly, of the parasite giving 

 rise to it. Filth and neglect favor parasitic development, but 

 do not of themselves produce the disease. 



Symptoms. — Ordinary or sarcoptic mange is characterized, 

 at its earliest period, by intense itching. If the skin of the 

 nffected part is examined, there will be observed small red 



