These patches of hair loss start out as scabs. Sometimes it's just the fur that pulls out right away, sometimes the scab area turns into dried blood. They're all over his body now after we've taken him to the vet. The vet couldn't identify what this was but said it wasn't a fungus or mange. It bothers me now that all he did was give Fatboy cephalexin and ketoconazole without "knowing" what exactly it was.
Fatboy aka Stinky :)