Dogs: Is it strange that my chocolate Lab lets the cat sleep with him?

This is a very big lab - over 90 pounds. He was 6 years old when he was neutered 2 years ago. The cat is a very small two year old spayed Siamese. He lets her do anything, he even lets her eat out of his bowl. He will not let our other two big dogs near that bowl. She stays there with him sleeping all night until... show more This is a very big lab - over 90 pounds. He was 6 years old when he was neutered 2 years ago. The cat is a very small two year old spayed Siamese. He lets her do anything, he even lets her eat out of his bowl. He will not let our other two big dogs near that bowl. She stays there with him sleeping all night until he gets up in the morning.

He is a friendly dog and he is not aggressive except for guarding his bowl from the other two dogs.

Could it be that this dog is trying to be a parent to the cat or be thinking that she belongs to him?
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