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I have two sites that have no duplicate content (yet).  One ranks better than the other but has a crappy hyphenated domain name (Domain A), and the other one is the "brand site" with a better domain name (Domain B).  I'm creating a blog with technical articles and corresponding videos.  I want the videos to refer to the better domain name (Domain B) because I can't see referring people to a hyphenated domain (it would sound horrible).  But, the hyphenated domain has a better chance of improving it's rankings (long story why).  Can I duplicate the content and just use a canonical tag on Domain B to give the credit to Domain A?  If I do that, is it done on each post?  Or the blog's main page?  What I think would happen is any links to Domain B would pass the juice to Domain A.  Is that correct? I know Canonical's are tricky and I don't want to screw this up, so I'd greatly appreciate some advice from the experienced people on here. Thank you.