PARASITOLOGY. 57 



Animal Infested. — The dog. 



Parts Infested ; Symptoms. — The parasite burrows 

 into the hair or sebaceous follicles, occluding the 

 ducts and producing pustules. These pustules are 

 prominent, and give the skin a rough appearance. 

 The animal is usually first attacked by the parasite 

 in the region of the breast, legs, axillary and facial 

 regions. The skin becomes red, and hence it is 

 called red mange. Considerable irritation accompa- 

 nies the malady. The dog scratches and bites the 

 parts, the -hair falls out and the skin becomes thick- 

 ened. In later stages the entire cuticular surface 

 becomes affected. 



Treatment. — Successful treatment of this malady is 

 difficult because of the difficulty of getting the solu- 

 tion to the interior of the pustules. A mixture of 

 gasoline, oil of tar and oil of cade has been used with 

 more or less good results. Also 



Oleo-resin aspidii 8 parts 



Creolin 42 parts 



Alcohol 50 parts 



Demodex Folliculorum, variety Suis. 



History. — Frequently found in America and in 

 Europe, 



A7iimal hifested. — The pig. 



Condition Produced. — The parasites attack the cu- 

 ticular surface in the axillary region and flanks ; 

 then the disease spreads over the entire surface of 

 the body and legs. The skin becomes thickened and 

 rough. The pustules push up, giving the skin a 

 papillated appearance. 



Mode of Infestation. — The animal may be infested 



