956 Scabies. 



1. Sarcoptic Scab. This disease, Mliicli is very general in 

 dogs, occurs most frequently on the head, the bridge of the nose, 

 the orbital rims or on the base of the ears; not infrequently, 

 however, the morbid changes occur on the front of the chest, on 

 the lower abdomen, in the axilla, on the inner surfaces of the 

 thighs, on the root of the tail, and subsequently they pass on 

 to the other parts of the body, and finally extend over the whole 

 body. Little papules appear on round inflamed places, some of 

 them changing to vesicles or even to pustules, especially on thin- 

 skinned places. On the diseased skin profuse bran-like scales are 

 formed at first, and later yellowish gray crusts ; the skin thickens 

 in consequence of frequent scratching or rubbing and exhibits 

 thick folds on face, neck and chest. The hair falls out prema- 

 turely and in this way irregularly shaped bald spots form, which 

 coalesce into large hairless patches. As in horses this form of 

 mange frequently runs its course accompanied hy profuse des- 

 quamation (Fig. 145). 



Fig. 145. iiarcoptic manye in the dog. 



The development of the disease is mostly accompanied l)y 

 violent itching, whereupon the animal becomes very restless if 

 kept warm, and injures the affected places by frequent scratch- 

 ing, gnawing and rubbing. If the disease is prolonged and 

 spreads to the greater part of the body, the animals become 

 emaciated and at times emit a peculiar mouse-like smell 

 (Hebrant & Antoine). Finally, if no treatment is undertaken, 

 tliey die with symptoms of cachexia. 



2. Dermatophagic Scab. (Ear mange. Scabies auricu- 

 laris.) In the external auditory meatus of the dog dermato- 



