Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
Has no feet, but travels far. Is literate, but not a scholar. Has no mouth, yet clearly speaks.
What has three feet but no arms or legs?
Its title means book.
What covers its face with its hands, speaks no language, yet most known what it's saying?