Red dye is carcinogenic definitely something you want to avoid in any food whether it's for a dog or even rats.
It is contained in many cheap dog food to make them look more meaty looking and therefore appealing.
The only cheap dog food I know of without those dies and that has the right protein content is Doggy Bag from tractor supply.
Unfortunately Canadian TSC doesn't seem to carry Doggy Bag from what I've seen at a few different locations. And they looked at me like I was a freak when I asked about ordering in Mazuri lol