. Diseases of the dog and their treatment. had four dogs, two adults and two pups, and kept themfor months with a bitch that was badly affected with acari, but failedto get any signs of transmission. When the animals have been experi-mentally inoculated Haubner reported a case in which twenty-four hoursafter inoculation there were all the marks of the disease and the saccontained eggs and larvse. A second inoculation cured itself spontane-ously. Other observers have had similar experiences. It seems that topropagate the disease the animal must have a certain predisposition, thenature of which
. Diseases of the dog and their treatment. had four dogs, two adults and two pups, and kept themfor months with a bitch that was badly affected with acari, but failedto get any signs of transmission. When the animals have been experi-mentally inoculated Haubner reported a case in which twenty-four hoursafter inoculation there were all the marks of the disease and the saccontained eggs and larvse. A second inoculation cured itself spontane-ously. Other observers have had similar experiences. It seems that topropagate the disease the animal must have a certain predisposition, thenature of which has not been satisfactorily explained. Young dogs whenexposed to infection seem to take it more readily than older dogs, butwhether it is congenital is a question. The natvu-al method of contagionis the contact of healthy dogs with diseased ones, but there is no doubtthat some individuals ai-e immune. Clinical Symptoms and Course.—These are distinguished by a pustu-lar and sc^uamous form of eruption, but both forms are apt to be united. DERM(JDKCTES K(JLl,lCUl-ORUM {.hrmodeUk mange.) ACARUS DEM OBEX FOLLICULORUM 471 in the same animal. The pustular form is the most common, and maybe recognized by the hair falling out, by hypenemic and swollen skin,which becomes thickened and in folds, and red from lack of pigment,forming nodules often the size of a millet seed, which change frombluish-red to yellow pustules, and finally the purulent bloody contentsescape, and in it and under the membrane we find hundreds of acari. The itching, as a rule, is never very great, as in sarcoptic mange,and in some cases not even present. When the affected cutaneousregions are scratched or rubbed, the patients, as a rule, resent it and donot derive the pleasure that scratching gives in sarcoptic mange. Thedisease spreads very slowly, the eruption starting at the head and betweenthe toes, and in only very rare instances does it cover the whole body(see Plate). The parts that are affected finally heal
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