I had trouble (not as much) with a Golden Retriever showing signs of aggression. The dog rescue organization said do not allow the dog on the bed, they think they are alpha. Also, when feeding, require the dog to wait and to look at you before feeding. There are other tools, but those two worked for me.
Yea, I had a golden retriever years ago. It growled at me once when I gave it a real bone. After scruffing him lightly we played take the bone .... give it back ... take the bone ... for a while, he never acted up again.
Unless you want to talk about the time he dove into Buena Vista Lagoon and swimming out to the island and refusing to swim back.