How do you agree on those root principles? Don't you need a set of even lower level shared rules and ability that allows you to agree on anything in the first p

How do you agree on those root principles? Don't you need a set of even lower level shared rules and ability that allows you to agree on anything in the first place? If I show the paper with the rules to a dog, I don't think they can agree or disagree with me in any meaningful way, despite otherwise being reasonably intelligent creatures. Could there be aliens that are vastly different from us that can make rules that we would be unable to agree to? Could there be aliens similar to us, that would have different means to agree that are incompatible with ours?