. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 14 CIRCTTLAB 338, XT. S. DEPT. OF AGRICULTURE. FianRB 10.—The sucking louse of dogs, Linognatlms piliferus. Fe- m^e. Ventral view. Enlarged. Prom Neveu-Lemaire, 1912. (Measurements: Male, meters long; female, 2 millime- ters long.) The sucking louse, Linognathus piliferus (synonym, Haematopinus piliferus), is pale yellow, less than one twelfth of an inch long, and has a long, slender head (fig. 10), very different from the wide, blunt head of the biting louse. It may appear blue after feeding on bloo
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 14 CIRCTTLAB 338, XT. S. DEPT. OF AGRICULTURE. FianRB 10.—The sucking louse of dogs, Linognatlms piliferus. Fe- m^e. Ventral view. Enlarged. Prom Neveu-Lemaire, 1912. (Measurements: Male, meters long; female, 2 millime- ters long.) The sucking louse, Linognathus piliferus (synonym, Haematopinus piliferus), is pale yellow, less than one twelfth of an inch long, and has a long, slender head (fig. 10), very different from the wide, blunt head of the biting louse. It may appear blue after feeding on blood. The biting louse, Trichodedes lotus (synonym, T. canis), is clear yellow in color, Avith darker markings, smaller than the sucking louse, and has a short, wide, blunt head (fig. 11). Cats are susceptible to attacks by the louse, Trichodedes subros- tratus, which is about the size of T. lotus of the dog, but has a more pointed head. This is the only louse infesting cats; it is not common. Symptoms.—The sucking Hce feed on se- rum and blood, and the biting lice feed on the scales, scurf, and superficial portions of the skin. In either case they cause irritation, which may be excessive in heavy infestations. The itching due to their bites causes the in- fested animal to scratch and rub, sometimes causing sores in this manner, and constitutes a drain on the nervous energy. Long-haired dogs appear to be more susceptible to louse infestation than short-haired dogs, and pups and very old dogs are more susceptible to infestation and suffer more from it than dogs of about mature age. The biting louse shares with the flea the role of intermediate host of the common double-pored tapeworm (p. 28), the louse becoming infested with the intermediate stage of the tapeworm as a result of swallowing tape- worm eggs as it feeds on the contaminated skin of the dog, and the dog becoming infested with the tapeworm by swallowing such infested lice. The tapeworm sometimes occurs in man, especia
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