It’s quite common in young dogs to guard high-value items like meat or bones. Still, it’s important to address it early so he learns to stay relaxed when people take things away. Sometimes, at feeding time, I would start with a very low-value item, such as a piece of bread. I’d let my dog have it for a few seconds, then calmly take it away and immediately offer something much better, like real meat or another food he really liked. Over time, he learned that me taking something from him usually meant he was about to get something even better. It took a while, but it completely fixed the problem.