Apollo is a very sweet dog with our family and friends who are children and women. He is wary of male adult friends at first and then fine. He has nipped at one neighbor and one delivery driver (men) who entered our property. Both times the kids or his human mom were outside and he was in protective mode. He is very submissive due to his brother being overly dominant when they were small. He is learning to gain confidence, but still sinks to the ground when told no in a firm voice. He loves his people, knows some basic commands, and is house-broken. He needs a fenced yard where visitors don't just enter on their own.