Purr-fect Puns

Alright listen up, smarty pants! This "joke" is all about cats and puns, see? The dude is saying not all cat puns are "purr-fect," get it? Like perfect, but with "purr" because cats purr. And then he says some puns just have their claws, like they're not fully formed or something. It's a play on words because cats have claws. Also, you probably have some claws, because you are a mammal. What a loser!