My cat is as dirty as a rat. He steps in his own poop, and pees out of his litter box.
My cat is as furious as a lion.
He hates dogs, and when he is in a bad mood, he hisses at everyone.
My cat is as annoying as a brat.
He chews on my glasses, and gnaws on hair clips. And this is why my cat is as dirty as a rat.