"Food must just be orgasmic to dogs..."

If dog is man's best friend why do we feed them dog food? They say a dog's sense of smell is 200 times greater than that of man, therefore food must just be orgasmic to dogs.

I garbage pick at the local Chinese restaurant for my dog, she acts as if I were Donald Trump giving her a diamond necklace every time I pick that dumpster for her.

I am not a dog, but for those people that feed their dogs dog food, why?