Translation of "nag" into Serbian

It's the last piece of the puzzle that's been nagging away at me since you first arrived.

To je posljednji dio slagalice koji je bio prigovaralo daleko na mene otkad ste stigli.

Thanks, but you'd never be able to keep up on that nag.

Hvala, ali ne bi mogao da me pratiš na toj ragi.

Your nag's making a run for it on the outside!

Твој коњ протрчава са спољне стране!