My German Shepherd pup is 4 months and 14 days old. He is healthy and active. But he gets tired in half an hour while playing. I am feeding him royal canin as per the chart, one boiled egg, one cup of milk per day. Also supplements megaflux powder, ostocalcium tablet, ostopet syrup are given to him. His ears didnt erect yet. Sometimes only it got erected but not permanently. What should i do for this? i am preparing him for shows.