I have him in training only second class today. He does wonderful there will sit,lay down, stay for 20 seconds and walk on leash. Unfortunately he starts playing and as soon as he got the upper hand on a dog at least twice his size he got aggressive again. When I fed him dinner tonight I was stepping between him and his dish to show him I’m the alpha first time fine second time bit me. Swatted his butt ha backed off. I made him sit at my feet until he has calmly waiting then I gave him his food back and waited for him to finish. Is this correct thing to do?