Hell, I have had people she growls at feed her cheese (her favorite treat next to meat) and she still growls.
I do think dogs are racist though, the neighbor on my other side who owns a Rottweiller, who has visiting rights with his x wife for a weekend a month. (freaks) growls at my black neighbor, he even said the dog doesnt like black people, (He cant go out back for fear of that dog) we told his friend that, who insisted on testing this for himself, and the rott charged and was about to kill them, as we all escaped back into my door, yet me or any other white person can walk out there without a problem.
My dog does like the Arab guy at the mini-mart though, Muhammed gives Misfit the day old hotdogs, makes misfit happy.