How can yout ell if your cat is happy? If your cat controls your life, bosses you around, and sleeps all day long, chances are good you have a happy cat. (Never mind about the happiness of the cat owner.)
Still, if you want additional proof that your cat may be happy or unhappy, you can read this article that highlights different signs to look for such as noticing where your cat sleeps. If your cat hides, that cat is probably scared and unhappy, but if the cat sleeps out in the open, that cat is probably happy. And if that cat sleeps all over your bed or couch, forcing you to sleep on the floor, that cat is probably happier still.
To find out more ways to tell if your cat is happy, read more here.