Cows are inherently supposed to be the dumbest mammals on the planet,
As usual, we may have been lied to buy the rumor mill.
Either that or we are about to be over run by The Planet of the Cows!

Cows are godlike,
Cows are wise.
Cow's have come down from the skies.
Without cow pie being hurled,
One day cows will rule the world!

For as smart as he is, his face looks a little derpy

That's part of their ruse-They stand around a lot, stare, and won't move when you tell em too sometimes and when they do they take their time.

Red queen effect: Parasitic humans feed off of the cow, steals the natural flowing water and installs human-centric water holes. In competition with the human parasite the cow is forced to learn to use the water pump. And thus the arms race between cow and human.

Who will win?

My money is that humans destroy themselves and cow survives, finally free of it's parasitic relationship with the upright mammals. They then go on to evolve into upright cow people. Only to encounter the humans again.

They then join with the radioactive green humans (nuclear fallout survivors) and zombie humans (the ones that didn't survive the fallout but were taken over by parasites of their own) to kill the humans, many of whom are dwarves and really small midgets.

Some hippies that bonded with trees are found to have survived, each with their own vision of what it is to be a tree hugger. Some of them join the humans (with their now dominant midget genes) and some of them join the green humans and cow people.

Along the way we discover that in China pandas have evolved into panda people and all along there were werewolves and shit. Including dimensions made entirely of fire with slimes that thrive off of radiation, only to become what is perceived as fire elementals and H.P. Lovecraft's things were real too. Oh and the entire pantheon of all people from all of time.

Society rebuilds itself but war never changes.