What does it mean that my 8yo dog destroys his beds constantly?

He takes long walks twice a day, one hour in the morning and like 1-2 in the evening. He gets a lot of attention and has two beds in the kitchen and one in the backyard and he goes in and out whenever he wants. He has a big garden and also he always has best food. But we don’t know why he does this or whether it means he is stress or frustrated with something