like a dog with a bone就是不依不饶，没完没了地想的意思。

【例句】
I was late once, and my boss is like a dog with a bone, bringing it up every chance she gets.
我有一次迟到了，我的老板不依不饶，一有机会就提起。

Jeez, Mona. You're like a dog with a bone. Let it go.
天哪，莫娜，你就像个乱咬人的疯狗。别较真了。