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Thanks.  You're right - I was making it to complicated so I just acquired an easier to remember domain that will 301 over to a single copy of the blog.  I think putting a canonical on every post and hoping for the best would be, as you say, shooting myself in the foot.

Thanks for the help.

Thanks, and yes - I did over-complicate my explanation.  There are a lot of articles out there about a cross-domain canonical, so I think it could be done, but maybe there's a simpler way to do this without duplicating content.

I want the authority to go to the hyphenated domain (it's higher ranked and I'm trying to push it a little further).  So if MyDomainA/blog doesn't exist, but I add a 301 to send that to My-Domain-B/blog, what happens if there's a link to MyDomainA/blog?  Would that still pass authority if the linked url (MyDomainA/blog) doesn't really exist?

Thanks again.

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.