Oliver, almost 1 year old has stared behaving weird

by Engela snyman
(South Africa )

Hi my puppy Oliver Standard Shnauzer almost 1 year old very observing very alert to clever for his size and very very spoiled.he got out of the courtyard last Sunday i think there is a female on heat in the neighbourhood. When he got out another dog about the same size as Oliver but a full grown male Chow gave him a go on the neck no open wounds but he definitely hurt a muscle in his neck. But since he got and go the smell of the female he lost his appetite. He will only eat nice snacks and eats and only if he feels like it. Is it normal behaviour....its like he feel very sorry for himself.