Premium foods tend to be richer and more caloric dense than lower quality foods, therefore you need to feed LESS of the premium foods. Dogs often get overweight on these foods because owners are so used to feeding, say, 6 cups a day of the lower quality foods where you may only need to feed 2-3 cups a day of the premium food.

Check the kcal/cup content on the food... actually, it may be impossible to find it on the low quality food bag as many food companies don't list the kcals at all.

My Aussie is right at 40# and eats a premium food that has 468 kcal/cup and when I did the math to figure out how many kcals/day she needed, it wound up being 2c of this food per day (yes, there is an equation to figure it out, if you want to get that in depth about it). So, in theory since your BC is around the same weight as my girl, and depending on the food, you should really only be feeding your dog around 2c/day on a more premium food.

Versus Pedigree Adult only has 290 kcal/cup (I had to do A LOOOOT of searching to find this out, btw, as they don't make the information readily available as premium brands will), so you'd need to feed nearly DOUBLE the amount of this food as you would a more premium brand.

TL;DR: Dogs tend to gain weight on more premium foods because they're more caloric dense, meaning you should be feeding LESS of it to meet their nutritional needs, but owners tend to over feed it.

Forgot to add....... the feeding guidelines on the side of the bag are just that -- guidelines. And they're guidelines for the dog's IDEAL weight, not their current weight. Food companies make money off selling dog food... so the guidelines are often telling owners to feed a little more than they should be. The guidelines also don't take into account individual dogs' metabolism, activity level, build, etc... which realistically would be impossible to do anyway. I never follow the guidelines and when people ask me how much to feed I tell them not to pay TOO much attention to them, but to use them LOOSELY.

Basically... if your dog is gaining weight, feed less. If they are losing weight, feed more. Even if it goes against what the "guidelines" say you should be feeding.

Hope that all makes sense!!!!!! I have done A LOOOT of research and hands-on with stuff like this if you're confused or have more questions