What is specified as a crucial component for keeping a Rat Terrier content daily, beyond just long walks?

Answer

Dedicating at least thirty minutes daily to interactive brain games, scent work, or skill practice

A key area of need is mental engagement; thirty minutes daily dedicated to interactive brain games, scent work, or skill practice is described as necessary, treating training like a dedicated job.

What is specified as a crucial component for keeping a Rat Terrier content daily, beyond just long walks?
DogpestbreedcompanionRat Terrier