Teardown!?

DIYed putting the pickets on a new privacy fence (doggo needs to run). Never done this before, never even used a nail gun before. It was 2 full terribly hot day’s and there is too much space at bottom. Pickets are uneven across rails and gap to ground is 6in in some places. Anyway to salvage this without having to tear them off and redo? Ways to fill gaps for dog? Have pictures but don’t know how to put here.