Ehrlichiosis is commonly known in Central America as "tick fever". These are intracellular bacterial parasites of the white blood cells of the hosts (the ones that fight infections) and are closely related to the rickettsiae, which cause Rocky Mountain Spotted fever in humans, among other diseases. Canine ehrlichiosis is often but not invariably fatal (two types of human ehrlichiosis are also seen in the US and elsewhere). Both canine and human types can be treated after diagnosis with appropriate antibiotics (such as the tetracyclines). I don't know how wise it is to bring a dog to an island like San Pedro, inasmuch as Vet. Facilities (not to mention Veterinarians!) are quite limited in diagnostic capacity (or were when I left in July of 1999). This last statement absolutely doesn't reflect on either the Vets. I met in San Pedro or on the mainland, but rather on the lack of diagnostic facilities available in the country. For what it's worth, Vets. on the mainland told me while I was in San Pedro that they had cases of leishmaniasis in dogs there (another nasty disease). You'd probably do best to find a good friend/relative to leave your dog with back home.