My dogs want chocolate. They've had it before (not purposely) and I have to remove it from their paws and mouths (I have a kid). That is lethal in large quantities but they still want it and will go to great lengths to get itYou're suggesting purina isn't interested in making a profit?
All animals know what's best for them.
The only possible exception is humans because they are the only ones capable of presupposing that they know more than nature. Only humans would eat something awful because they think it's healthy. No other animal has that capability.
Grandma fed her dogs predominantly table scraps for 80 years, so I feel pretty good about it. No one loved dogs more than grandma. If I didn't make it to dinner in time then the dogs would be eating my food.
Whichever one has the nutrition that they currently crave. I go through that with cats every single day. Sometimes they eat chicken, sometimes kibble, sometimes grain-free kibble, sometimes canned food, sometimes kitten formula. I even have a cat that eats cantaloupe.
Years will go by.
You're making that claim, but where is the evidence? I don't know anything about horses to know if that is true or not.
I know about geese, ducks, cats, dogs, humans. I know they know what is good for them, with the exception of some humans.
Why not? Companies can offer anything they want. You can't make conclusions based upon what is offered for sale.
And you're still stuck on the idea that anyone really knows what nutritional requirements are. That is FAR from being settled.
How do you even know what diet is good for you? The FDA can't even make up its mind how much carotene is equivalent to retinol. https://en.wikipedia.org/wiki/Retinol#Dietary_intake
Thriving contributes to surviving. Animals won't survive for long unless they're thriving.
Make a poll asking who has ducks and geese older than mine and see what they eat. So far, people think 7 years is an impressive age for ducks and a nigh-impossible accomplishment which is evidence that the proper feed is garbage. Where is the evidence to the contrary? All I have seen so far is unsubstantiated claims and appeals to authority.
I mean, I'm doing the impossible and you're telling me I'm doing it wrong. Why should I disregard my own experience in favor of some theories?