The dispute centres on a US regulation in place since 2009 which requires that certain product labels must include an item's country of origin.
Canada, which said that the measure adversely affects its pig and cattle breeders, successfully challenged the regulation before the WTO.
America's largest trade partner had previously fought the so-called COOL (country-of-origin labeling) rule at the WTO saying it discriminated against Canadian products, and won yesterday.
But Washington tweaked the regulation to circumvent the ruling.
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The WTO reaffirmed "Canada's long-standing position that these measures are blatantly protectionist and discriminate against Canada," Fast added.
"In light of the final ruling, and due to the fact that the United States has continued to discriminate against Canadian livestock products, Canada will be seeking authority from the WTO to use retaliatory measures on US agricultural and non-agricultural products," he said.
Canada could slap duties on a multitude of US goods that range from fruits and chocolates to cereal, jewellery and wooden furniture.