. Le chien comme porteur de parasites et de maladies. Les chiens en tant que porteurs de la maladie ; les chiens. Le chien COMME UN OABBIEE PAEASITES ET DE MALADIE. 21. Fig. 13.-tique américaine du chien (Der- macentor variaMUs) ; Homme, dor- sal. (À partir de Hooker, Bisliopp, et du bois, Bureau de l'entomologie.) Ne pas prendre soin d'eux. Dans de bonnes conditions d'austérité chiens peuvent se débarrasser des puces et exempte de eux. Les tiques.-Dans ce pays, le chien est connu pour être l'habituel ou occa- sionnel-porteuse de 11 espèces de tiques, presque tous sont aussi occasibnal ou habituelle des parasites de l'homme ou de stock. De cette façon le chien sert la tique par f

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. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. THE DOG AS A OABBIEE OF PAEASITES AND DISEASE. 21. Fig. 13.—American dog tick (Der- macentor variaMUs) ; male, dor- sal view. (From Hooker, Bisliopp, and Wood, Bureau of Entomology.) take no care of them. Under proper conditions of restraint dogs may be rid of fleas and kept free from them. Ticks.—In this country the dog is known to be the usual or occa- sional-carrier of 11 species of ticks, almost all of which are also occasibnal or habitual parasites of man or stock. In this way the dog serves the tick by furnishing it with nourish- ment 3.and also aids in spreading in- festation, conveying ticks in this way to man much more effectively than other animals are able to do, for the reason that there is no other animal in such close contact with man, with so many liberties, and with such a wide and unrestrained range during the periods when it is not with its owner. These habits of the dog make it an object of suspicion in connection with tick-eradication work. Such ticks as Vermacentor variabilis (fig. 13), which are common on the dog, are brought into houses rather frequently and have many opportunities to attack man. Such ticks as the spotted-fever tick, known as Ber- macentor andersoni or Dermacentor venustus (fig. 14), are seldom found on dogs, but in view of the fact that the bite of one tick may result in spotted fever and the death of the person bitten, even such in- frequent transmission by dogs must be guarded against. This tick is known to occur in Montana, Wyo- ming, Colorado, New Mexico, and the States west of these, with the exception of Arizona. Spotted fever is knoWn to occur in a number of these States, and with the tick pres- ent its occurrence and spread in the other States depend merely on the chance of a carrier of some sort com- ing into them under conditions which will permit of the tick having access to the carrier and to other ani- mals or persons. Dogs m

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