Have you ever owned a cat or dog? My experience is that a percentage of them will overeat unless constantly monitored, eat things that are outright dangerous, etc. What is it that makes humans the stupid ones, here?
Left to their own devices (they weren't each individually heavily supervised - especially when on the range), of the domesticated ones, the only ones that would gorge themselves to death were the horses (when they thought they were getting away with something), with the minor exception of the dogs (who might eat the other animal's grain-based food out of jealousy, and explode their gut because they ate the wrong food because of stupidity)
I did not find that, unmonitored, most animals would eat too much of the wrong type of food for too long (loco-weed for cows might be an exception - but that didn't kill them).
The difference is that in the wild, this is tends to be quickly followed by a resource crash from a normal cycle (e.g. winter crash after summer glut) and / or population explosion.
I don't know that any organism has had evolutionary-scale periods over which to psychologically integrate an access to essentially unlimited (in time and quantity both) resources.
I suspect the correcting mechanism for that is generally predation.
https://en.wikipedia.org/wiki/Labrador_Retriever#Inherited_d...