Cats 'exploit' humans by purring

[Chalex4]

Well, you all know the saying:

Dogs have owners, cats have servants - so why should a cat have to pay attention to a measly human?

[Calneon]

Well, you all know the saying:

Dogs have owners, cats have servants

I don't understand that, if you have a dog you have to walk it, feed it, clean it, keep it in at night, give it a bed, etc etc. A cat you just feed it and it does all the rest itself. Cats are for lazy people