Special visa application is needed for Pakistani nationals.  This can be downloaded from here.
Applications in duplicate have to be submitted in person at the Consulate .

Foreigners of Pakistani origin who continue to hold dual nationality viz. Pakistani nationality as well as foreign nationality must apply for visa on their Pakistani passports along with the special application visa form for Pakistani nationals.

Applicants are requested not to make enquiries in this regard by phone, e-mail, personal visit, fax or letters which, due to constraints, we will not be able to respond to.

Canadians of Pakistani origin who no longer have Pakistani nationality and Pakistani passport may apply for visa on their Canadian passport with visa application form in duplicate meant for foreigners, but would have to submit a certified copy of the surrender certificate stating that they have renounced their Pakistani citizenship along with an affidavit duly notarized stating therein that they no longer hold Pakistani citizenship and Pakistani passport.

It can take several months before a decision can be conveyed on visa requests by Pakistani nationals and persons of Pakistani Origin.