580 



DISEASES OF THE SKIN. 



Symptoms in the dog. Follicular mange is very common in 

 the canine species ; it is observed in all races, but retrievers and 

 terriers are predisposed to it. Its intensity and course vary accord- 

 ing to the individual : in some it remains localized for three mouths ; 

 in others it spreads rapidly over the entire surface of the body. 

 While it is very contagious, few attempts to transmit it to the 

 healthy dog have been successful. Haubner is the only author 

 who has obtained a positive result. Attempts of experimental 

 transmission to other species have not been more successful. Sev- 

 eral cases of accidental transmission to man have, however, been 

 reported. The propagation of the disease to the different regions is 

 by rubbing ; the pustules are torn open, and their contents, so to 

 speak, sown upon the whole surface of the body. Extension after 

 a first curative friction takes place in the same way. 



The manifestations of follicular mange vary considerably accord- 

 ing to the quantity of parasites accumulated in the sebaceous glands. 



1. Squamous form. In a large number of cases the symptoms 

 are reduced to the falling out of the hair and to an abundant epi- 

 dermic desquamation ; the surface of the skin, which is entirely 

 dry, presents only the symptoms of a slight inflammation (squamous 

 eczema). This form is especially observed upon the eyelids and in 

 the neighborhood of the eye. Within a few days, a peri-ocular 

 depilated blotch is produced, the integument being red and covered 

 with thin epidermic lamellse. The benign character of these mani- 

 festations, especially the absence of pustules, obscures the diagnosis 

 and misleads the practitioner, who regards it as an eczematous 

 disease. Any blepharitis accompanied by depilation should be 

 subjected to microscopic study. This variety of mange quite fre- 

 quently shows itself by disseminated circumscribed depilatious upon 

 the whole surface of the body, without the existence of the slightest 

 pruritus; these symptoms then show a striking resemblance to those 

 of scurvy. The increased pigmentation of the bare regions is a 

 symptom of follicular mange. 



2. Pustulous form. This is more frequent than the preced- 

 ing ; it is characterized by an intense dermatitis with a formation 

 of pimples and pustules, these latter being due to the suppuration 

 of the sebaceous glands, which are overrun by the parasites. At 

 times it is localized upon certain regions ; at other times it is ex- 

 tended over the whole surface of the body. In the former case it 

 is located preferably upon the forehead, lips, eyelids, and feet. Its 



