If a cow is content, it's obvious —in the same way it's obvious when cats and dogs are happy.
In fact, as the folks at The Gentle Barn — an animal sanctuary in California, Tennessee, and Missouri —demonstrate in their sweet video below, happy cows act remarkably similar to their canine and feline friends when they're in a good mood. Just look for these five signs (the last being quite surprising for anyone not that familiar with farm animals, like me):
1. They roll onto their backs, hoping for a good belly rub;
2. They get physical with cuddles and licks;
3. They chew — not on a bone or catnip, but on cud, which "means they feel safe;"
4. They break out into zoomies.
5. And last but not least, "when they're extremely relaxed and content," they purr. As in a long, loud, joyous purr that will put any cat to shame.
See also: "Cows go wild for new scratch brushes: a must-have for your farm"