The disease, "Salmon poisoning," in dogs and foxes was known before America was settled by white people. Dr. E. F. Perrot was one of the first to work with the disease and in 1925 concluded that salmon poisoning was due to an amoeba. At this time he recommended calomel as the curative agent.
Coons, Max C.
""Salmon Poisoning" in Dogs,"
Iowa State University Veterinarian: Vol. 3
, Article 10.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss1/10