I would imagine the fact that the production of Menu Foods is in Canada is because US regulations are stricter.
They are and they aren’t. FDA allows them to rearrange the ingredients on the bag — not in order of largest quantity first (as in human labeling) and allows them to use 3D meats in processing. AAFCO which controls pet food is a farce.
I dont't know if that is the reason for all these dog food brands use Menu to producte the pet food, but I know I was shocked that the brands I was buying--and I've tried many high end brands for my spoiled girls--that they all were produced at Menu. Amazing.