According to reputable veterinarians, cats need good physical and mental care. If they feel happy, they will take care of themselves well. Cats will groom themselves and keep clean when they are happy. And it can even groom other cats. Or even their owners, to express happiness and trust. If it’s not happy, it will stop grooming and become rough so you know if something goes wrong.
Old cats may play less, but they will still be happy, and will interact freely with their owners to keep them happy. As with other household pets they like and trust. Cats will show you that they are very happy and want to play in many ways, perhaps by lying on their side and twitching their tails. Cats will happily chase lights from a laser pen or paper ball and string, you don’t need to buy expensive cat supplies, it’s an interaction that makes them happy.
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