My dog got loose and came back covered in what i suspect is deer blood from nearby hunters. could i be exposed to brucellosis from cleaning off my dog?

Not from deer: Brucellosis would be a worry if the blood was from a wild pig, caribou, bison, or elk. But it is pretty rare. The CDC has not updated their page since 2010! https://www.cdc.gov/brucellosis/exposure/hunters.html Contact your state health department or the CA dept of agriculture and ask what the incidence of brucelloisis is in your state now. Write the CDC and ask them to update their page!