External Parasites of Dogs and Cats

has been observed only in imported dogs and as a consequence no preventive measures are possible. In areas where the disease is commonly encountered, however, control measures are directed against sandflies, which transmit the parasites. Although phenamidine has been used in the treatment of leishmaniasis, relapses are common and specific medication is generally unsatisfactory. The only trematode that concerns dog owners in this country is limited in its distribution to the Pacific Northwest. This parasite is responsible for the transmission of rickettsialike organisms that cause "salmon poisoning" of dogs and related carnivores, but it does not produce symptoms of disease by itself. Treatment of salmon poisoning, therefore, is directed against the rickettsia rather than the flukes, for which there is no effective treatment. The drugs that have been most effective in the treatment of salmon poison517