Hm, you're right, brucellosis isn't on there. I suppose because it's not breed-specific; all dogs regardless of breed (or mix) should be tested for brucellosis prior to breeding, and prior to each breeding. (Heavily used stud dogs might be tested every few months, instead of every breeding, provided the bitches all have negative results.) The other thread explains it, as well, but brucellosis can be transmitted via non-sexual means, so dogs and bitches, maiden or experienced, should be tested.