豚

How it works

は (topic) raises 豚(ぶた) (pig) as the topic. The ending stacks two grammar pieces: 太る(ふとる) (get fat) in te-form joins くる (come), and 〜てくる (coming to) expresses a change unfolding over time — “is getting fatter and fatter”. That whole chain then sits in the progressive 〜ている ((ongoing)) to show it's still happening.