After 40,000,000 years one might think there would be a convenient way to feed a dog complete nutrition in every bite.
They've only been domesticated in the last blink of an eye, in terms of how long their species has been on the planet, and only a tiny fraction of that time eating commercial dog food. Before commercial dog food, they just ate discarded bones, guts, heads, feet, pelts, unwanted organs, supplemented with whatever they could catch and kill (or find already dead) around the homestead.
