The world loves grumpy cats (just ask Grumpy Cat herself). We tend to think of our feline friends as sassy, independent, and apathetic creatures—and for many cat lovers, that low-key attitude is all just a part of their charm. But are our cats really unhappy? In honor of Happy Healthy Cat Month, here are six ways you’ll know if your cat is living his best life (even if he’ll never admit it).

One popular myth about cats is they’re happiest having the freedom to go outside. This is far from the truth. There are many cats who are born and raised indoors who have no interest in going outside and would panic if they found themselves on the wrong side of the door.