Re:Hot Dog Joints in Canada
I'm French Canadian, so mostly familiar w/ HD stands in Quebec, the poutine province. IMO, the best HD joint is "Chez Bébé", located in Jonquiere. They serve the HD all dressed w/ french fries or poutine stuffed inside the HD. Delicious!!! Also in the same region, there is "Le Pavillon du Hot Dog", "Chez Mamy", Le Roi des Patates.
There are a few famous hd chains throughout the province such as Valentine, La Belle Province, Lafleur, The Montreal Pool room, etc...
There are very few hd carts in QC, mostly due to the climate and they are not allowed at all in Montreal where most of the population reside. That's why there are many chains of stands where they serve your basic HD menu, burgers, french fries, poutine of course, and ice cream.
I hope this helps although I'm a little late for your CDN HD party. :)