Buffalo Trace White Dog Mash #1 is an unaged bourbon distillate, often called "white dog" or "new make." Because it has not been matured in oak, it shows the raw spirit before barrel aging adds the familiar color, vanilla, and deeper wood influence.
For a novice drinker, this is best understood as a look at bourbon in its earliest stage. It tends to emphasize grain character and youthful intensity rather than the rounded sweetness and oak-driven richness found in mature bourbon.