Cats have no need of philosophy. 

Obeying their nature, they are content with the life it gives them.

 In humans, on the other hand, discontent with their nature seems to be natural. 

With predictably tragic and farcical results, the human animal never ceases striving to be something that it is not. 

Cats make no such effort.

 Much of human life is a struggle for happiness. 

Among cats, on the other hand, happiness is the state to which they default when practical threats to their well-being are removed. 

They possess as their birthright a felicity humans regularly fail to attain.