From what I read, the erlichia could have been hiding in his spleen for years and wouldn't show up in his blood work until it became active again. Or it could be new. The RMSF is a new development, however. I'm waiting for the pathologists report because the vet says they can tell a lot from just looking at the white cells. Meanwhile, he has the zoomies when I get home again and I swear there's some greyhound in there somewhere because of his howly barked greetings. The vet's office is a zoo. They have one doctor and a tech out on vacation, and can't even get to answering the phones at the front desk. Certainly it was nuts when we were there last week. I'm calling back in about an hour.