dog, can mean anything from 'close friend' to 'you peice of trash' but it doesn't have to be send to a person of an Afro-American race, it can be said to anyone of anyrace.
I don't know how to define Milky. almost 40 year old ex-groupie still lecturing newer, much prettier, younger ho's. kinda like your mom "when I went to school, I had to walk 20 miles"