PARASITES AFFECTING THE SKIN 19 
It shows more vesicles than mange, and usually there is 
more serous discharge. It is non-infectious. No para- 
site can be found, though it is a matter of difficulty to 
find the Sarcoptes under any circumstances, owing to 
the depth to which they burrow. Moreover, dry eczema, 
except when it has become chronic, yields more readily 
to treatment, and its appearance on the dog is usually 
much more rapid than in the case of mange. 
Mange in Cats. 
The Sarcoptes minor, which attacks the cat, is, as its 
name implies, very small. It is distinguished by the 
presence of numerous bristles along its dorsal aspect, and 
the anus is remarkable in that it opens on to this surface. 
The favourite situation is the head, and less commonly 
the limbs. The feet and paws often become affected 
also, from scratching the affected areas. The eyelids 
become denuded of hair in the majority of cases, and 
the skin over the whole area is much wrinkled. The 
cat frequently shakes the head, and constantly rubs 
against hard objects. Emaciation quickly sets in, and 
death may result. 
Treatment of Mange in the Dog and Cat.—It is abso- 
lutely essential to disinfect and destroy all bedding, 
rugs, etc., upon which the affected animal is accustomed 
to sleep ; otherwise a permanent cure is impossible. 
In treating terriers and the larger dogs, a soda-bath 
should first be given, and, when thoroughly dry, one 
half of the body should be dressed with the oily mixture 
previously described. In from four days to a week the 
dog should again be washed, and the other half dressed, 
and in the course of another week all grease should be 
removed by a soda-bath. Cure in most cases should 
then be complete. Unless the dog is kept out of doors, 
ol. picis and oily dressings are objectionable. The 
