cat-and-dog life字面意思是“猫和狗的生活”，猫和狗在一起总是会打架，所以 cat-and-dog life 引申为吵吵闹闹的生活；经常吵架的生活。

【例句】
MR and mrs black lead a cat-and-dog life. I hate living near them.
布莱克夫妇过着成天吵吵闹闹的生活，我讨厌做他们的邻居。

My sister I lived a cat-and-dog life when we were growing up.
我和我妹从小一起长大，也吵个不停。