Purring is a universal sign of contentment in cats. If your cat is purring, it's a good indication that they're happy and relaxed.
They do have a way of twitching their tails when they're happy. If you see your cat's tail twitching, it's a good sign that they're content.
When cats rub against you, they're depositing their scent on you. This is a way of marking you as their territory and showing you that they love you.
Cats love to bask in the sun. If you see your cat curled up in a sunny spot, it's a good sign that they're happy and content.
Cats are playful creatures. If your cat is playful and engaged, it's a good sign that they're happy and content.
Cats groom themselves for a variety of reasons, but one of the reasons is to show that they're happy and content.
Cats sleep a lot, but they're more likely to sleep soundly when they're happy and content. If you see your cat sleeping soundly, it's a good sign.