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thanks for the additional input Eric. Google + button also on my site

appreciate input so far. Have added videos, social media like and share buttons. etc. will investigate the info provided by Zachary

Looking for concrete ways to continue to improve SERP results. thanks

Gianluca, thanks for your time. Before I ask my web host to do this one point of clarification. In step 2 you mention redirect of example.com to www.example.com   Since www.example.ca is my focus should this be example.ca to www.example.ca or is it correct as stated?

thanks very much. As suggested above I just went to google webmaster tools and did specify www.example.com and www.example.ca as the preferred domains. Do I still need to do 301 redirects as well or just a redirect from www.example.com to www.example.ca

all four (www.example.com, example.com, www.example.ca and example.ca) have same content. I have focused all of my SEO efforts on the www.example.ca  version. It now ranks well and has good authority and PR but I am concerned about the other versions. I though of adding a canonical tag to the header of the pages on the website making the www.example.ca  version the canonical version and then doing 301 redirects  (Do I redirect the www.example.com to www.example.ca and then redirect the example.ca to the www.example.ca or is there more to this?). I can easily go the cname route with my server host but I had heard that a 301 is better. Does this added info add clarity to what I am asking? thanks very much for your answers and time til now

I have a website with a couple of domains pointing to one IP address. Let's say I have two domains   www.example.com and www.example.ca

I also see during my SEO analysis that the example.com and the www.example.com (same for the example.ca and the www.example.ca) are triggering server responses.

How do I deal with this issue for best SEO. Canonical links? CNAME, or 301 redirects?  thanks