My dog bites me when I try and get something from him how do I fix it?

He’s 5 months old and only occasionally does this. Today he got something from the garbage and I tried taking it out of his mouth and he bit me aggressively, he’s also done this with some food I had given him a couple weeks ago. He is constantly taking things off counters, tables, and beds so I do take things from... show more He’s 5 months old and only occasionally does this. Today he got something from the garbage and I tried taking it out of his mouth and he bit me aggressively, he’s also done this with some food I had given him a couple weeks ago. He is constantly taking things off counters, tables, and beds so I do take things from him a lot but usually I give him a treat once he’s let go of it.
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