It's easy! Start by using ProQuest Dissertations & Theses Full Text (link below, as well as an explanatory handout). You can also use the Theses Canada Portal from Library & Archives Canada (also linked below).
You can find many Dalhousie dissertations and theses through the method outlined on the left (ProQuest).
For older Dalhousie dissertations and theses: The Archives & Special Collections has a comprehensive collection of Dalhousie Master's theses and doctoral dissertations dating from 1890 to the present. Print copies are available for in-house use is Special Collections.
Search Novanet to find Dalhousie dissertations and theses: