Dogs are more domesticated than cats, hence they care about more things that humans care about than cats. Cats, despite being only slightly less domesticated, still retain more of their sense of independence - though it sometimes feels like they are just kidding themselves - like they know deep down they aren't wildcats prowling a jungle, eating only what they kill, but they like to maintain that mental image.
Dogs are more domesticated than cats, hence they care about more things that humans care about than cats. Cats, despite being only slightly less domesticated, still retain more of their sense of independence - though it sometimes feels like they are just kidding themselves - like they know deep down they aren't wildcats prowling a jungle, eating only what they kill, but they like to maintain that mental image.