But when someone does us wrong, we usually say "You dog!" When referring to other in a derogatory manner, women especially refer to men in a derogatory tone as a "real dog."
I was in a hotel somewhere... I was arguing with a hotel maid, who would not allow me to take the bed pillows home with me. Told her I could buy them. She said NO and notified the front desk clerk, whom appeared in my hotel room and asked me to leave... Awkward dream I guess..