I have a black cat that will do the same.

My dog used to resource guard pretty bad - we would always trade him. If he had a chew and it was time to given it up, offer him something different in exchange. Reward him when he grabs the new item you give him.

If it’s a food bowl, trade him a treat for the bowl. We used to use the “find it” game by throwing treats and he would run for those and then we could grab the item we wanted.