The domain extension having specific country code indicates to search engines which country your content is targeted at.
Even if you do go with a .com or other domain extension as your primary URL, it is recommended to register the . ca variation. This will not only protect your brand or trademark, but your .ca will also improve the opportunities for people to find your website if searching from within Canada.
According to research conducted by the Strategic Council, 85% of Canadians prefer to be on a . CA domain than a .com when supporting local businesses. It’s more Candian.
Search HERE to see if your domain is available
Find out more about .ca domains here