Library & Archives Canada has just put the images for the 1881 Canada Census online. The census is fully searchable and you can view the page for any ancestor name you are interested in.
I found the online images impossible to read and could not see a method of enlarging them but it is easy to save to your hard drive. Then simply open in any graphic program and enlarge to a size that suits you. See AllCensusRecords.com for more census records online