RH: Don't know where in Ontario you live, but home for me is about half way down to the Seaway from Ottawa.
SWMBO has a scurvy wee black cur with a SERIOUS food allergy problem (diagnosed by her vet daughter).
We buy locally Hill's Prescription Diet z/d - Ultra Allergen-Free in the 12.5 Kg bag. Price recently went up and wifie now pays "over $80.00" + 13% Gouge & Screw Tax.
Hope this helps.