I have not noticed a difference in how my dogs track or do nose work while using Wondercide. However, I do not spray them directly before we do the activity. For tracking, I spray them the night before, and then once the tracks are done. For nosework classes, I spray in the morning, and then before we go to bed after class. When I am just practicing at home, I make no changes in when or how often I use Wondercide. For trials, I do not apply anything to them with scent for 48 hours beforehand, and then I just spray them down once the trial is over.
Train the dog in front of you.